Medical Lab Technician Exam Questions And Answers!
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Are you gearing up for the Medical Lab Technician exam? Look no further, as we've curated a comprehensive set of questions and answers to aid in your preparation. The role of a Medical Laboratory Technician is pivotal in conducting various microscopic and bacteriological tasks for both medical and research purposes.
Engage in this medical lab technician exam to assess your grasp of the subject matter and gauge your readiness for the upcoming test. By comparing your score with others, you can identify your strengths and areas that may need additional focus.
This exam aims to evaluate your proficiency Read morein the field, helping you refine your knowledge and enhance your performance. Embrace this opportunity to measure your readiness for the Medical Lab Technician exam and boost your confidence for success. Good luck, and may your preparation yield fruitful results!
Medical Lab Technician Questions and Answers
- 1.
What is the normality of a solution of sodium hydroxide (molecular weight=40) containing 20 grams in 100 mL of solution?
- A.
5.0N
- B.
1.0N
- C.
0.5N
- D.
0.4N
Correct Answer
A. 5.0NExplanation
The normality (N) of a solution is defined as the number of equivalents of solute per liter of solution. To calculate the normality, we need to determine the number of equivalents of sodium hydroxide in the given solution. Sodium hydroxide (NaOH) is a strong base that dissociates completely in water to form one hydroxide ion (OH-) per molecule. Therefore, the number of equivalents is equal to the number of moles of sodium hydroxide.
First, we need to calculate the number of moles of sodium hydroxide in 20 grams. The molecular weight of sodium hydroxide is 40 g/mol, so the number of moles is 20 g / 40 g/mol = 0.5 mol.
Next, we need to determine the volume of the solution in liters. The given solution has a volume of 100 mL, which is equal to 0.1 L.
Finally, we can calculate the normality by dividing the number of equivalents (moles) by the volume in liters: 0.5 mol / 0.1 L = 5.0N.
Therefore, the normality of the sodium hydroxide solution is 5.0N.Rate this question:
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- 2.
Carbohydrates are organic compounds of 1. carbon 2. hydrogen 33. oxygen
- A.
1 and 2 only
- B.
1 and 3 only
- C.
2 and 3 only
- D.
1,2, and 3
Correct Answer
D. 1,2, and 3Explanation
Carbohydrates are organic compounds that consist of carbon, hydrogen, and oxygen atoms. These atoms are bonded together in specific ratios, with the general formula for carbohydrates being (CH2O)n. Therefore, the correct answer is 1, 2, and 3, as all three elements are present in carbohydrates.Rate this question:
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- 3.
WHich one of the following is a function of gamma globulin?
- A.
Transports glucose
- B.
Regulates body temperature
- C.
Performs as fibrinogen for blood coagulation
- D.
Provides humoral immunity
Correct Answer
D. Provides humoral immunityExplanation
Gamma globulin is a type of protein found in the blood that plays a crucial role in providing humoral immunity. It is a component of the immune system and contains antibodies that help in fighting off infections and diseases. These antibodies are produced by B cells and are responsible for recognizing and neutralizing foreign substances such as bacteria and viruses. Therefore, gamma globulin is essential for the body's immune response and helps protect against various pathogens.Rate this question:
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- 4.
Which instruments do NOT measure concentrations of a particular molecule but of the total ions and molecules in general (number of moles per kilogram of water)?
- A.
Osmometers
- B.
Spectrophotometers
- C.
Blood gas analyzers
- D.
Immunochemical analyzers
Correct Answer
A. OsmometersExplanation
Osmometers are instruments that measure the total ions and molecules in a solution, rather than specifically measuring the concentration of a particular molecule. They do this by determining the osmotic pressure of the solution, which is a measure of the number of moles of solute per kilogram of water. Osmometers are commonly used in medical and research laboratories to measure the osmolality of bodily fluids and other solutions. This information is useful in diagnosing and monitoring certain medical conditions, as well as in various scientific and industrial applications.Rate this question:
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- 5.
Osmolality of a solution is determined by measuring
- A.
Freezing point depression
- B.
Refractive index
- C.
Specific gravity
- D.
Ionic strength
Correct Answer
A. Freezing point depressionExplanation
Osmolality of a solution is determined by measuring freezing point depression. This is because the freezing point of a solution is lower than that of the pure solvent, and the extent of this depression is directly related to the number of solute particles present in the solution. Osmolality is a measure of the concentration of solute particles in a solution, and by measuring the freezing point depression, one can determine the osmolality accurately. Refractive index, specific gravity, and ionic strength are not directly related to osmolality measurement.Rate this question:
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- 6.
Most methods for the determination of blood creatinine are based on the reaction of creatinine and
- A.
Sulfuric acid
- B.
Alkaline picrate
- C.
Acetic anhydride
- D.
Ammonium hydroxide
Correct Answer
B. Alkaline picrateExplanation
The correct answer is alkaline picrate. Most methods for the determination of blood creatinine are based on the reaction of creatinine with alkaline picrate. This reaction forms a colored complex, which can be measured spectrophotometrically. By measuring the absorbance of the complex, the concentration of creatinine in the blood sample can be determined.Rate this question:
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- 7.
Unconjugated bilirubin is also known as
- A.
Conjugated bilirubin
- B.
Prehepatic bilirubin
- C.
Total bilirubin
- D.
Biliverdin
Correct Answer
B. Prehepatic bilirubinExplanation
Unconjugated bilirubin refers to bilirubin that has not yet been processed by the liver. It is produced when red blood cells break down and is transported to the liver for further processing. Prehepatic bilirubin is another term for unconjugated bilirubin, as it indicates that the bilirubin has not yet reached the liver. Conjugated bilirubin, on the other hand, refers to bilirubin that has been processed by the liver and is ready to be excreted. Total bilirubin is the sum of both unconjugated and conjugated bilirubin. Biliverdin, on the other hand, is a green pigment that is converted to bilirubin in the body.Rate this question:
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- 8.
The ketone bodies include acetoacetic acid, acetone, and
- A.
Lactic acid
- B.
3-hydroxy butyric acid
- C.
Oxaloacetic acid
- D.
Acetic acid
Correct Answer
B. 3-hydroxy butyric acidExplanation
The ketone bodies are acetoacetic acid, acetone, and 3-hydroxy butyric acid. Lactic acid, oxaloacetic acid, and acetic acid are not considered ketone bodies.Rate this question:
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- 9.
Blood glucose levels are directly regulated by the hormone
- A.
ACTH
- B.
Insulin
- C.
Thyroxin
- D.
Hydrocortisone
Correct Answer
B. InsulinExplanation
Insulin is the correct answer because it is the hormone responsible for regulating blood glucose levels. Insulin is produced by the pancreas and helps to lower blood glucose levels by allowing cells to take in glucose from the bloodstream. It also promotes the storage of glucose as glycogen in the liver and muscles. Without sufficient insulin, blood glucose levels can become too high, leading to conditions like diabetes. ACTH, thyroxin, and hydrocortisone are not directly involved in the regulation of blood glucose levels.Rate this question:
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- 10.
Albumin, alpha1, alpha2, beta, and gamma globulin are electrophoretic fractions of
- A.
Hemoglobin
- B.
Amino acid
- C.
Serum protein
- D.
Serum lipoprotein
Correct Answer
C. Serum proteinExplanation
Albumin, alpha1, alpha2, beta, and gamma globulin are electrophoretic fractions of serum protein. Electrophoretic fractionation is a technique used to separate different proteins based on their charge and size. In this case, the given fractions are all components of serum protein, which is a mixture of proteins found in blood plasma. Therefore, the correct answer is serum protein.Rate this question:
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- 11.
Which one of the following methods could be used to study protein abnormality?
- A.
Isoenzyme electrophoresis
- B.
Immunoelectrophoresis
- C.
Electrophoresis of penicilliamine-treated serum
- D.
Blood viscosity studies
Correct Answer
B. ImmunoelectropHoresisExplanation
Immunoelectrophoresis is a method that combines electrophoresis and immunodiffusion techniques to study protein abnormalities. It involves separating proteins based on their charge using electrophoresis and then detecting specific proteins using antibodies. This technique is particularly useful for identifying and quantifying abnormal proteins, such as those associated with autoimmune diseases or cancer. By comparing the protein profiles of healthy individuals with those of patients, researchers can gain insights into the presence and nature of protein abnormalities, aiding in diagnosis and treatment.Rate this question:
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- 12.
Most of the plasma thyroxine (T4) is
- A.
Bound to globulin
- B.
Bound to albumin
- C.
Free
- D.
Bound to cholesterol
Correct Answer
A. Bound to globulinExplanation
Plasma thyroxine (T4) is mostly bound to globulin because globulin is a type of protein that acts as a carrier for T4 in the bloodstream. This binding helps to protect T4 from being rapidly metabolized or excreted by the body. By being bound to globulin, T4 can be transported to target tissues where it can be released and exert its hormonal effects.Rate this question:
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- 13.
Sodium is responsible for the maintenance of
- A.
Blood coagulation
- B.
Osmotic pressure of body fluids
- C.
Cardiac muscle contractions
- D.
Salt intake
Correct Answer
B. Osmotic pressure of body fluidsExplanation
Sodium plays a crucial role in maintaining the osmotic pressure of body fluids. Osmotic pressure refers to the pressure exerted by the solutes in a solution, which helps regulate the movement of water across cell membranes. Sodium ions are one of the main solutes in extracellular fluids, and their concentration affects the osmotic pressure. By controlling the osmotic pressure, sodium helps maintain the balance of water inside and outside cells, ensuring proper hydration and functioning of cells and tissues throughout the body.Rate this question:
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- 14.
When using a buffer with a pH of 8.6, each of the serum proteins in an electrical field migrates toward
- A.
The positive pole
- B.
The negative pole
- C.
Either pole
- D.
Both poles
Correct Answer
A. The positive poleExplanation
When using a buffer with a pH of 8.6, the serum proteins have a net negative charge. In an electrical field, negatively charged particles migrate towards the positive pole. Therefore, the serum proteins will migrate towards the positive pole in this scenario.Rate this question:
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- 15.
The end-product of purine metabolism is
- A.
Urea
- B.
Creatine
- C.
Creatinine
- D.
Uric acid
Correct Answer
D. Uric acidExplanation
Uric acid is the correct answer because it is the end-product of purine metabolism. Purine metabolism involves the breakdown of purine nucleotides, which are components of DNA and RNA. The breakdown of these nucleotides leads to the production of uric acid. Uric acid is then excreted from the body through urine. Urea, creatine, and creatinine are not the end-products of purine metabolism, making them incorrect choices. Urea is a waste product of protein metabolism, creatine is involved in energy metabolism, and creatinine is a waste product of muscle metabolism.Rate this question:
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- 16.
The degree that a procedure deviates from a known value or from a calculated mean value is known as
- A.
Coefficient variation
- B.
Quality control
- C.
Stardard deviation
- D.
Percent deviation
Correct Answer
C. Stardard deviationExplanation
The degree that a procedure deviates from a known value or from a calculated mean value is known as the standard deviation. The standard deviation measures the amount of variation or dispersion in a set of values. It is calculated by taking the square root of the variance, which is the average of the squared differences between each value and the mean. A higher standard deviation indicates greater variability, while a lower standard deviation indicates less variability.Rate this question:
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- 17.
Which one of the following hemoglobin determination methods is recommended by the International Committee for Clinical Laboratory Standards and the National Committee for Clinical Laboratory Standards?
- A.
Oxyhemoglobin
- B.
Sulfhemoglobin
- C.
Methemoglobin
- D.
Cyanmethemoglobin
Correct Answer
D. CyanmethemoglobinExplanation
Cyanmethemoglobin is the recommended method for hemoglobin determination by the International Committee for Clinical Laboratory Standards and the National Committee for Clinical Laboratory Standards. This method involves the conversion of hemoglobin to cyanmethemoglobin, which is stable and can be measured accurately. This method is widely used in clinical laboratories for accurate and reliable measurement of hemoglobin levels in blood samples.Rate this question:
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- 18.
When using white blood cell pipets for performing a white cell count, blood is diluted
- A.
1:200
- B.
1:50
- C.
1:20
- D.
1:10
Correct Answer
C. 1:20Explanation
In order to perform a white cell count using white blood cell pipets, blood needs to be diluted. The dilution ratio determines the amount of blood that is mixed with a diluent solution. A dilution ratio of 1:20 means that for every 1 part of blood, 20 parts of diluent solution are added. This dilution allows for an accurate and manageable count of white blood cells, as it helps to reduce the concentration of cells in the sample and makes it easier to count them under a microscope.Rate this question:
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- 19.
An RBC exhibiting hypochromia would be described as being
- A.
Variable in shape
- B.
Packed with hemoglobin
- C.
Markedly bluish in color
- D.
Markedly pale in central color
Correct Answer
D. Markedly pale in central colorExplanation
An RBC exhibiting hypochromia would be described as markedly pale in central color. Hypochromia refers to a condition where the red blood cells have a decreased amount of hemoglobin, resulting in a paler appearance. This paleness is particularly noticeable in the central area of the cell. It is not related to the shape, hemoglobin content, or bluish color of the RBC.Rate this question:
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- 20.
When performing automated cell counts, most automated cell counted instruments
- A.
Count nucleated red blood cells with erythrocytes
- B.
Count nucleated red blood cells with platelets
- C.
Count nucleated red blood cells with leukocytes
- D.
Do not count nucleated red blood cells
Correct Answer
C. Count nucleated red blood cells with leukocytesExplanation
Most automated cell counting instruments count nucleated red blood cells with leukocytes. Leukocytes, also known as white blood cells, are responsible for the body's immune response and are found in the bloodstream. Nucleated red blood cells are abnormal cells that may be present in certain medical conditions. Since leukocytes are also present in the bloodstream and are involved in the immune response, automated cell counting instruments include them when counting nucleated red blood cells.Rate this question:
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- 21.
During the maturation of a blood cell, the nuclear chromatin pattern becomes
- A.
Finer
- B.
More dense
- C.
Less dense
- D.
More acidic
Correct Answer
B. More denseExplanation
As a blood cell matures, the nuclear chromatin pattern becomes more dense. This means that the DNA and associated proteins in the nucleus become more tightly packed. This denser chromatin pattern allows for more efficient regulation of gene expression and helps to maintain the stability and integrity of the genetic material within the cell.Rate this question:
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- 22.
An elevated leukocyte count with increased numbers of neutrophilic granulocytes USUALLY indicates
- A.
Bacterial infection
- B.
Viral infection
- C.
Infectious mononucleosis
- D.
Allergic reaction
Correct Answer
A. Bacterial infectionExplanation
An elevated leukocyte count with increased numbers of neutrophilic granulocytes usually indicates a bacterial infection. Neutrophilic granulocytes are a type of white blood cell that plays a key role in the immune response to bacterial infections. When there is an infection, the body releases more neutrophils to help fight off the bacteria. Therefore, an elevated leukocyte count with increased numbers of neutrophilic granulocytes is often seen in bacterial infections.Rate this question:
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- 23.
On most automated cell counted, background counts are made using
- A.
Distilled water
- B.
Highly-diluted blood
- C.
Diluting fluid
- D.
Lysing reagent only
Correct Answer
C. Diluting fluidExplanation
The correct answer is diluting fluid because it is commonly used in automated cell counters to create a dilution of the blood sample. This dilution helps in obtaining accurate and reliable cell counts by ensuring that the cells are evenly distributed and not clumped together. The diluting fluid also helps in maintaining the integrity of the cells and preventing any interference or contamination from other substances present in the sample.Rate this question:
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- 24.
Cerebral spinal fluid patients with post-cerebral hemmorrhage appears
- A.
Clear (colorless)
- B.
Bright red
- C.
Light yellow or straw colored
- D.
Greeen
Correct Answer
C. Light yellow or straw coloredExplanation
The correct answer is light yellow or straw colored. Cerebral spinal fluid in patients with post-cerebral hemorrhage may appear this way due to the presence of red blood cells and breakdown products of blood. The yellow color is caused by the bilirubin pigment, which is a product of the breakdown of red blood cells. This color indicates that there is a small amount of blood present in the fluid, but not enough to cause it to be bright red or green.Rate this question:
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- 25.
On an automated blood cell counter, the two parameters affected by a high background count would be
- A.
WBC and Hgb
- B.
RBC and Hgb
- C.
RBC and WBC
- D.
Hct and WBC
Correct Answer
C. RBC and WBCExplanation
A high background count on an automated blood cell counter indicates an increased number of non-cellular particles in the sample, which can interfere with the accurate counting of red blood cells (RBC) and white blood cells (WBC). These non-cellular particles can be debris, platelets, or other substances that may be mistaken as cells by the counter. Therefore, a high background count would affect the accurate measurement of both RBC and WBC parameters.Rate this question:
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- 26.
Leukemia may be suspected when a manual hematocrit determination reveals
- A.
Hemolysis
- B.
Icteric plasma
- C.
A high hematocrit
- D.
A heavy buffy coat
Correct Answer
D. A heavy buffy coatExplanation
A heavy buffy coat may suggest the presence of leukemia. The buffy coat is the layer of white blood cells and platelets that separates from the red blood cells after centrifugation. In a healthy individual, the buffy coat is usually thin. However, in leukemia, there is an abnormal increase in the number of white blood cells, leading to a heavier buffy coat. This can be an indication of leukemia and further diagnostic tests may be required to confirm the diagnosis.Rate this question:
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- 27.
Hansel's stain is appropriate for
- A.
Circulating eosinophiles
- B.
Phagocytic neutrophils
- C.
Nasal secrection for eosinophiles
- D.
Leukocytes in spinal fluid
Correct Answer
C. Nasal secrection for eosinopHilesExplanation
Hansel's stain is appropriate for nasal secretion for eosinophils. This staining technique is used to identify and count eosinophils, which are a type of white blood cell involved in allergic reactions and parasitic infections. By staining the nasal secretion with Hansel's stain, eosinophils can be easily visualized under a microscope, allowing for the assessment of eosinophil levels in the sample. This can be useful in diagnosing and monitoring conditions such as allergic rhinitis or eosinophilic rhinosinusitis.Rate this question:
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- 28.
Reticulocytes contain
- A.
DNA remnants
- B.
RNA remnants
- C.
Basophilic granules
- D.
Howell-Jolly bodies
Correct Answer
B. RNA remnantsExplanation
Reticulocytes are immature red blood cells that still contain some RNA remnants. These remnants are leftover from the process of synthesizing hemoglobin, which occurs in the reticulocytes. As the reticulocytes mature into erythrocytes (mature red blood cells), the RNA remnants are removed, resulting in cells that do not contain any DNA remnants. Therefore, the correct answer is RNA remnants.Rate this question:
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- 29.
A substance that produces a prolonged prothrombin time when given orally is
- A.
Heparin
- B.
Protamine sulfate
- C.
Saliclate
- D.
Coumadin
Correct Answer
D. CoumadinExplanation
Coumadin is the correct answer because it is an anticoagulant medication that works by inhibiting the synthesis of certain clotting factors in the liver, including prothrombin. When Coumadin is given orally, it prolongs the prothrombin time, which is a measure of how long it takes for blood to clot. This effect is desired in certain medical conditions where there is a risk of excessive blood clotting. Heparin, protamine sulfate, and saliclate do not produce a prolonged prothrombin time when given orally.Rate this question:
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- 30.
Clot retraction can be employed as an indicator of
- A.
Factor VII deficiency
- B.
Factor X deficiency
- C.
Hemophilia
- D.
Platelet function
Correct Answer
D. Platelet functionExplanation
Clot retraction refers to the process by which a blood clot becomes more compact and retracts, leading to the formation of a stable clot. This process is primarily dependent on the function of platelets, which play a crucial role in clot formation and stabilization. Therefore, clot retraction can be used as an indicator of platelet function. Factor VII deficiency and Factor X deficiency are related to the coagulation cascade, while hemophilia is a genetic disorder that affects the blood's ability to clot. None of these conditions directly impact clot retraction, making platelet function the correct answer.Rate this question:
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- 31.
The quantity of inactivated serum used for qualitative VDRL test is
- A.
0.02 mL
- B.
0.05 mL
- C.
0.10 mL
- D.
0.15 mL
Correct Answer
B. 0.05 mLExplanation
The correct answer is 0.05 mL. In the qualitative VDRL test, a small amount of inactivated serum is used to detect the presence of antibodies to syphilis. This test is used to determine if a person has been exposed to the syphilis bacteria. The quantity of 0.05 mL is sufficient to ensure accurate results without using an excessive amount of serum.Rate this question:
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- 32.
The RA latex test is used as a screening test for
- A.
Rheumatoid arthritis
- B.
Thyroiditis
- C.
Vulvovaginitis
- D.
Infectious mononucleosis
Correct Answer
A. Rheumatoid arthritisExplanation
The RA latex test is used as a screening test for rheumatoid arthritis. Rheumatoid arthritis is an autoimmune disease that causes chronic inflammation in the joints, resulting in pain, stiffness, and swelling. The RA latex test detects the presence of rheumatoid factor (RF), an antibody that is often found in the blood of individuals with rheumatoid arthritis. Therefore, a positive RA latex test indicates a higher likelihood of rheumatoid arthritis. The test helps healthcare professionals in diagnosing and monitoring the disease.Rate this question:
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- 33.
Rh immune globulin is given to an Rh (D)
- A.
Positive mother with an Rh(D) negative fetus
- B.
Positive mother who has an Rh(D) negative husband
- C.
Negative mother who has delivered an Rh(D) positive fetus
- D.
Negative mother with an Rh(D) negative fetus
Correct Answer
C. Negative mother who has delivered an Rh(D) positive fetusExplanation
Rh immune globulin is given to a negative mother who has delivered an Rh(D) positive fetus. This is because Rh immune globulin helps prevent the mother's immune system from developing antibodies against the Rh(D) antigen, which can occur when the mother is Rh(D) negative and the fetus is Rh(D) positive. If the mother develops these antibodies, it can lead to complications in future pregnancies with Rh(D) positive fetuses. Therefore, giving Rh immune globulin to the negative mother after delivery of an Rh(D) positive fetus helps prevent the development of these antibodies.Rate this question:
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- 34.
Which one of the following may detect a hemolytic transfusion reaction?
- A.
Urine porphyrins
- B.
Serum haptoglobin
- C.
Post-transfusion red blood count and hemoglobin
- D.
Pre-transfusion bilirubin
Correct Answer
B. Serum haptoglobinExplanation
Serum haptoglobin may detect a hemolytic transfusion reaction. Haptoglobin is a protein that binds to free hemoglobin released from red blood cells during hemolysis. In a hemolytic transfusion reaction, there is destruction of red blood cells, leading to the release of hemoglobin into the bloodstream. The binding of haptoglobin to free hemoglobin forms a complex that is then cleared from the bloodstream. Therefore, a decrease in serum haptoglobin levels may indicate a hemolytic transfusion reaction. Urine porphyrins, post-transfusion red blood count and hemoglobin, and pre-transfusion bilirubin are not specifically related to detecting hemolytic transfusion reactions.Rate this question:
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- 35.
To determine if a patient is A1 or A2, the blood is typed with
- A.
Anti-A serum
- B.
Anti-AB serum
- C.
Anti-A2 serum
- D.
Dolichos biflorus serum
Correct Answer
D. Dolichos biflorus serumExplanation
Dolichos biflorus serum is used to determine if a patient is A1 or A2. This serum is specifically used to detect the presence of A2 antigen on red blood cells. If the serum reacts with the blood sample, it indicates that the patient is A2. If there is no reaction, it means the patient is A1. The other serums listed (anti-A serum, anti-AB serum) are used for different blood typing purposes and do not specifically differentiate between A1 and A2.Rate this question:
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- 36.
Who is credited with processing the most readily acceptable theory of ABO inheritance?
- A.
Weiner
- B.
Landsteiner
- C.
Levine
- D.
Bernstein
Correct Answer
B. LandsteinerExplanation
Landsteiner is credited with processing the most readily acceptable theory of ABO inheritance. This is because Landsteiner discovered the ABO blood groups and proposed the theory of inheritance based on his experiments. His work laid the foundation for our understanding of blood types and their inheritance patterns, which has been widely accepted in the field of genetics and immunology.Rate this question:
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- 37.
The major cation found in the extra cellular fluid is
- A.
Chloride
- B.
Potassium
- C.
Sodium
- D.
Bicarbonate
Correct Answer
C. SodiumExplanation
Sodium is the major cation found in the extracellular fluid. Cations are positively charged ions, and sodium is the most abundant positively charged ion in the extracellular fluid. It plays a crucial role in maintaining fluid balance, regulating blood pressure, transmitting nerve impulses, and supporting muscle function. Chloride, potassium, and bicarbonate are also important ions in the body, but sodium is the primary cation in the extracellular fluid.Rate this question:
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- 38.
Antihuman serum globulin reagent
- A.
Is produced in humans
- B.
Occurs naturally in most humans
- C.
Is produced in laboratory animals
- D.
Never detects complement-dependent antibodies
Correct Answer
C. Is produced in laboratory animalsExplanation
The correct answer is "is produced in laboratory animals." This is because antihuman serum globulin reagent is a reagent that is used in laboratory tests to detect antibodies in human serum. It is produced by injecting laboratory animals with human serum globulin, which stimulates the animals to produce antibodies against the human serum globulin. These antibodies are then collected and used as the antihuman serum globulin reagent in laboratory tests.Rate this question:
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- 39.
Blood group A individuals have
- A.
Anti-A in their serum
- B.
Anti-B in their serum
- C.
Antigen A and B on their red cells
- D.
Anti-O in their serum
Correct Answer
B. Anti-B in their serumExplanation
Blood group A individuals have anti-B in their serum because they do not have the B antigen on their red blood cells. The presence of anti-B antibodies allows their immune system to recognize and attack any foreign blood cells that do have the B antigen, preventing incompatible blood transfusions.Rate this question:
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- 40.
A donor who recently tested positive for HBsAg should be deferred
- A.
For 6 months
- B.
For 1 year
- C.
For 5 years
- D.
Permanently
Correct Answer
D. PermanentlyExplanation
A donor who recently tested positive for HBsAg should be deferred permanently because HBsAg is a marker for hepatitis B virus infection. This means that the donor is currently infected with the virus and can transmit it to the recipient through blood transfusion. Therefore, it is necessary to permanently defer the donor to ensure the safety of the blood supply and prevent the transmission of hepatitis B to recipients.Rate this question:
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- 41.
Antihuman serum globulin (Coombs) is NOT used in performing
- A.
Reverse typing
- B.
Immunoglobulin testing
- C.
D(u) testing
- D.
Autoagglutination tests
Correct Answer
A. Reverse typingExplanation
Antihuman serum globulin (Coombs) is not used in performing reverse typing. Reverse typing is a blood typing technique that involves testing the patient's serum against known red blood cell antigens. Antihuman serum globulin (Coombs) is used in other blood typing techniques, such as direct typing and indirect antiglobulin testing, to detect antibodies that have coated the patient's red blood cells. However, in reverse typing, the patient's serum is tested for the presence of antibodies, so antihuman serum globulin (Coombs) is not necessary.Rate this question:
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- 42.
A mother is Rh(D) negative. The father is homozygous Rh(D) positive. All of their offspring will be
- A.
Erythroblastotic
- B.
Homozygous Rh(D) positive
- C.
Heterozygous Rh(D) positive
- D.
50% Rh(D) positive and 50% Rh(D)negative
Correct Answer
C. Heterozygous Rh(D) positiveExplanation
In this scenario, the mother is Rh(D) negative, which means she does not have the Rh(D) antigen on her red blood cells. The father is homozygous Rh(D) positive, meaning he has two copies of the Rh(D) antigen. Since Rh(D) positive is dominant over Rh(D) negative, all of their offspring will inherit one Rh(D) positive allele from the father and one Rh(D) negative allele from the mother, making them heterozygous Rh(D) positive.Rate this question:
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- 43.
According to Landsteiner, when a specific antigen is present on blood cells, the corresponding antibody
- A.
Is present in the serum
- B.
Is absent from the serum
- C.
Is present in the blood cells
- D.
May or may not be present depending on the agglutinogens present
Correct Answer
B. Is absent from the serumExplanation
According to Landsteiner, when a specific antigen is present on blood cells, the corresponding antibody is absent from the serum. This means that if a particular antigen is found on the surface of blood cells, the corresponding antibody that can recognize and bind to that antigen is not present in the serum. This is an important concept in blood typing and understanding immune responses, as it helps to explain why certain blood types can be incompatible with others.Rate this question:
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- 44.
Cell/antibody mixtures used in tube testing to determine ABO Group should be centrifuged for
- A.
15-30 seconds @ 1000
- B.
2 min @ 2000
- C.
3 min @ 3000
- D.
5 min @ 5000
Correct Answer
A. 15-30 seconds @ 1000Explanation
Cell/antibody mixtures used in tube testing to determine ABO Group should be centrifuged at a speed of 1000 for a duration of 15-30 seconds. Centrifugation is done to separate the cells from the serum or plasma in the mixture. This process helps in obtaining a clear supernatant, which is necessary for accurate interpretation of the test results. Centrifuging for a longer duration or at higher speeds may lead to hemolysis or improper separation of the components, affecting the reliability of the test.Rate this question:
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- 45.
Water-soluble pigments are produced by
- A.
Yeasts
- B.
Pseudomonas aeruginosa
- C.
Staphylococcus epidermidis
- D.
Group A streptococcus
Correct Answer
B. Pseudomonas aeruginosaExplanation
Pseudomonas aeruginosa is known to produce water-soluble pigments such as pyocyanin, pyoverdine, and pyorubin. These pigments are important for the survival and virulence of the bacterium. Pyocyanin, for example, has been shown to have antimicrobial properties and can help Pseudomonas aeruginosa compete with other microorganisms in its environment. Therefore, it is the most likely organism to produce water-soluble pigments among the options given.Rate this question:
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- 46.
A reactive fluorescent treponemal antibody (FTA-AB) test
- A.
Indicates no infection
- B.
Confirms the presence of treponemal antibodies
- C.
Indicates the severity of infection
- D.
Is positive during the chancre stage
Correct Answer
B. Confirms the presence of treponemal antibodiesExplanation
The correct answer, "confirms the presence of treponemal antibodies," indicates that a reactive fluorescent treponemal antibody (FTA-AB) test is used to detect the presence of antibodies produced by the body in response to a treponemal infection. This test is commonly used to diagnose syphilis, as the presence of treponemal antibodies confirms the infection. It does not indicate the severity of the infection or the specific stage of syphilis.Rate this question:
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- 47.
Which of the following is a strict anaerobe?
- A.
Bacillus anthracis
- B.
Listeria monocytogenes
- C.
Clostridium botulinum
- D.
Nocardia asteroides
Correct Answer
C. Clostridium botulinumExplanation
Clostridium botulinum is a strict anaerobe because it cannot survive in the presence of oxygen. It is a bacterium that produces the botulinum toxin, which causes the serious illness botulism. This bacterium is commonly found in soil and water, and it thrives in environments with low oxygen levels. Its ability to survive and produce toxins in anaerobic conditions makes it a strict anaerobe. Bacillus anthracis, Listeria monocytogenes, and Nocardia asteroides are not strict anaerobes as they can tolerate or even grow in the presence of oxygen.Rate this question:
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- 48.
Optochin is used to help identify
- A.
Streptococcus pneumoniae
- B.
Staphylococcus aureus
- C.
Streptococcus pyogenes (group A)
- D.
Strepococci producing alpha hemolysis
Correct Answer
A. Streptococcus pneumoniaeExplanation
Optochin is a chemical compound that is used in the identification of Streptococcus pneumoniae, also known as pneumococcus. This bacteria is a common cause of respiratory tract infections, such as pneumonia, and can also cause meningitis and other invasive diseases. Optochin is added to a culture of bacteria, and if the bacteria are sensitive to optochin, they will not grow. Streptococcus pneumoniae is sensitive to optochin, whereas the other bacteria listed in the options are not affected by it. Therefore, the correct answer is Streptococcus pneumoniae.Rate this question:
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- 49.
A trophozoite of Entamoeba histolytica usually contains
- A.
Bacteria and coarse granules in the cytoplasm
- B.
Eccentrically located endosome in the nucleus
- C.
A coarse, granular, blunt pseudopod
- D.
Red blood cells int he cytoplasm
Correct Answer
D. Red blood cells int he cytoplasmExplanation
A trophozoite of Entamoeba histolytica usually contains red blood cells in the cytoplasm. This is a characteristic feature of this parasite, as it is known to invade and feed on red blood cells. The presence of red blood cells in the cytoplasm can be used as a diagnostic feature to identify Entamoeba histolytica in a clinical sample.Rate this question:
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- 50.
Which media is used to ISOLATE Staphylococcus aureus from specimens that have mixed bacterial flora such as feces?
- A.
Mannitol salt agar
- B.
An enrichment broth
- C.
MacConkey agar
- D.
Eosin methylene blue agar (EMB)
Correct Answer
A. Mannitol salt agarExplanation
Mannitol salt agar is a selective and differential medium commonly used to isolate Staphylococcus aureus from specimens that contain mixed bacterial flora such as feces. This medium contains high salt concentration which inhibits the growth of most bacteria except for Staphylococcus species. Additionally, it contains mannitol and a pH indicator that allows for the differentiation of Staphylococcus aureus based on its ability to ferment mannitol, producing acid and causing a change in color of the medium. Therefore, mannitol salt agar is the appropriate choice for isolating Staphylococcus aureus from mixed bacterial flora.Rate this question:
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Oct 21, 2024Quiz Edited by
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