Bacteria And Prokaryotes Ews
Welcome to the electronic life science frontier classroom of the 21st century. There are over 4,000 species of bacteria have been named, and many more haven't been discovered. Bacteria occur in the widest possible range of habitats.
This test allows up an unlimited number of attempts to better help you in the learning and testing process. Each attempt will generate 30 out of a 45 question bank. So each test will have different questions.
This is a review of vocabulary terms, concepts, and ideas which support Read moreprokaryotes and their relationship with humans. When a "fill-in" type question appears in this test. Please enter your answer(s) using all lower case letters, unless you are directed to do otherwise.
I wish you good luck in learning about topics in microbiology and life sciences! It is a fun time in scientific research for middle & high school students.
Questions and Answers
- 1.
A facultative anaerobe can live with or without an oxygen atmosphere.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A facultative anaerobe is a type of organism that is capable of surviving in both aerobic (with oxygen) and anaerobic (without oxygen) environments. This means that it can switch between using oxygen for energy production when available and using alternative metabolic pathways in the absence of oxygen. Therefore, the statement that a facultative anaerobe can live with or without an oxygen atmosphere is true.Rate this question:
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- 2.
A Gram-negative bacterium does not retain the Gram stain and takes up a second _____ color stain.
Correct Answer
pinkExplanation
Gram-negative bacteria have a thin peptidoglycan layer in their cell wall, which does not retain the crystal violet stain used in the Gram staining procedure. Instead, these bacteria take up the counterstain, which is usually safranin or fuchsin, giving them a pink or red color under the microscope. This is why the correct answer is pink.Rate this question:
- 3.
A Gram-positive bacterium retains the Gram stain and appears _____ color.
- A.
Black
- B.
Blue
- C.
Pink
- D.
Purple
- E.
Orange
Correct Answer
D. PurpleExplanation
Gram-positive bacteria retain the Gram stain, which is a technique used to classify bacteria based on their cell wall composition. The stain causes the bacteria to appear purple under a microscope. This is because Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which traps the crystal violet dye used in the staining process. As a result, the bacteria retain the purple color even after the decolorization step.Rate this question:
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- 4.
A _____ bacterium use light energy and gets carbon from Carbon Dioxide.
- A.
Autotrophs
- B.
Chemoautotroph
- C.
Photoautotroph
- D.
Photoheterotroph
Correct Answer
C. pHotoautotropHExplanation
A photoautotroph is a type of bacterium that uses light energy and obtains carbon from carbon dioxide. This means that it can convert sunlight into energy through the process of photosynthesis and does not require organic compounds for carbon. This allows the bacterium to produce its own food and sustain itself without relying on external sources for energy or carbon.Rate this question:
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- 5.
A _____ is a coccus that occurs in chains.
- A.
Streptobacillus
- B.
Streptococcus
- C.
Streptospirillum
- D.
Staphylococcus
Correct Answer
B. StreptococcusExplanation
Streptococcus is the correct answer because it is a coccus that occurs in chains. The prefix "strepto-" indicates that the cells are arranged in chains, while "coccus" refers to the shape of the bacteria, which is spherical. Streptobacillus, Streptospirillum, and Staphylococcus are all incorrect answers because they do not fit the description of a coccus occurring in chains.Rate this question:
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- 6.
A _____ lives in very high salt concentrations.
Correct Answer
halophileExplanation
A halophile is a type of organism that can survive and thrive in environments with very high salt concentrations. These organisms have adapted to withstand the extreme conditions and are able to maintain their cellular functions in such environments. They have specialized mechanisms to regulate the salt concentration within their cells and protect themselves from the harmful effects of high salt levels. This adaptation allows halophiles to inhabit habitats such as salt lakes, salt pans, and salt mines, where other organisms would not be able to survive.Rate this question:
- 7.
A _____ obtains both energy and carbon from other organisms.
- A.
Autotrophs
- B.
Chemoautotroph
- C.
Chemoheterotroph
- D.
Photoheterotroph
Correct Answer
C. ChemoheterotropHExplanation
Chemoheterotrophs obtain both energy and carbon from other organisms. They rely on consuming organic molecules produced by autotrophs or other heterotrophs as their energy source. Unlike autotrophs, which can synthesize their own organic molecules from inorganic sources, chemoheterotrophs cannot produce their own organic molecules and therefore depend on consuming them from external sources. This makes chemoheterotrophs unable to generate energy or carbon independently, highlighting their reliance on other organisms for sustenance.Rate this question:
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- 8.
A(n) _____ is a short, hairlike structure which allows the transfer of DNA from one bacterium to another bacterium.
Correct Answer
pilusExplanation
A pilus is a short, hairlike structure found in bacteria that facilitates the transfer of DNA from one bacterium to another. This structure acts as a bridge between two bacteria, allowing the transfer of genetic material through a process called conjugation. The pilus extends from the surface of the bacterial cell and forms a physical connection with another bacterium, enabling the transfer of DNA molecules. This mechanism plays a crucial role in bacterial genetic diversity and the spread of antibiotic resistance genes among bacterial populations.Rate this question:
- 9.
A(n)_____ carries genetic information from one generation to the next generation.
- A.
Capsule
- B.
Chromosome
- C.
Flagellum
- D.
Pilus
Correct Answer
B. ChromosomeExplanation
A chromosome carries genetic information from one generation to the next generation. Chromosomes are structures found in the nucleus of cells and contain DNA, which carries the genetic instructions for the development and functioning of living organisms. During reproduction, chromosomes are passed from parents to offspring, ensuring the transmission of genetic traits and characteristics.Rate this question:
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- 10.
An obligate anaerobe cannot survive in the presence of oxygen.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
An obligate anaerobe is a type of organism that cannot survive in the presence of oxygen. This is because these organisms lack the necessary enzymes to break down toxic byproducts that are produced when oxygen is present. Therefore, the presence of oxygen is detrimental to their survival and they can only survive in environments where oxygen is absent.Rate this question:
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- 11.
Diplobacillus is a bacterium with rod-shaped cells arranged in pairs touching end-to-end?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Diplobacillus is a type of bacterium that has rod-shaped cells arranged in pairs, touching end-to-end. This means that the cells are elongated and occur in pairs, with each cell in the pair touching each other at their ends. This arrangement is characteristic of diplobacilli and distinguishes them from other types of bacteria. Therefore, the statement "Diplobacillus is a bacterium with rod-shaped cells arranged in pairs touching end-to-end" is true.Rate this question:
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- 12.
Fossil evidence indicates that the earliest prokaryotes on Earth lived about:
- A.
1 Billion years ago
- B.
1.75 Billion year ago
- C.
2 Billion years ago
- D.
2.5 Billion years ago
- E.
5 Billion years ago
Correct Answer
D. 2.5 Billion years agoExplanation
The correct answer is 2.5 Billion years ago. Fossil evidence suggests that the earliest prokaryotes, which are simple single-celled organisms without a nucleus, existed on Earth around this time. This evidence includes the discovery of ancient fossilized microorganisms in rock formations that date back to approximately 2.5 billion years ago. These findings provide valuable insights into the origins and early evolution of life on our planet.Rate this question:
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- 13.
One structure you would not find in a bacterial cells is a(n)_____.
- A.
Cell Wall
- B.
Capsule
- C.
Chromosome
- D.
Mitochondrion
- E.
Ribosomes
Correct Answer
D. Mitochondrion -
- 14.
What bacteria morphology is letter A?
- A.
Bacillus
- B.
Bacillus with flagella
- C.
Spirillum
- D.
Vibrio
Correct Answer
B. Bacillus with flagellaExplanation
The correct answer is Bacillus with flagella. Bacillus refers to a rod-shaped bacteria, and the presence of flagella indicates that it is capable of movement. Therefore, the correct answer is Bacillus with flagella.Rate this question:
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- 15.
What bacteria morphology is letter B?
- A.
Bacillus
- B.
Coccus
- C.
Diplococcus
- D.
Staphylococcus
- E.
Streptococcus
Correct Answer
E. StreptococcusExplanation
Letter B represents Streptococcus, which is a type of bacteria that appears in chains or clusters. This morphology is characterized by spherical or oval-shaped cells arranged in a linear or clustered pattern. Streptococcus bacteria are commonly found in the throat and can cause various infections, such as strep throat and pneumonia.Rate this question:
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- 16.
What bacteria morphology is letter C?
- A.
Streptobacillus
- B.
Staphylobacillus
- C.
Streptospirillum
- D.
Staphylococcus
Correct Answer
D. StapHylococcusExplanation
The correct answer is Staphylococcus. Staphylococcus is a type of bacteria that is characterized by its spherical shape and occurs in clusters. It is commonly found on the skin and mucous membranes of humans and animals. Staphylococcus can cause various infections, ranging from minor skin infections to more serious conditions such as pneumonia and bloodstream infections.Rate this question:
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- 17.
What bacteria morphology is letter D?
- A.
Bacillus
- B.
Coccus
- C.
Diplococcus
- D.
Staphylococcus
- E.
Streptococcus
Correct Answer
C. DiplococcusExplanation
Diplococcus refers to a type of bacteria that typically occurs in pairs. This morphology is characterized by two spherical cells that are joined together. The term "diplo" means double or paired, and "coccus" refers to a spherical or round shape. Diplococcus bacteria are commonly found in certain infections, such as pneumonia or meningitis.Rate this question:
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- 18.
What bacteria morphology is letter E?
- A.
Bacillus
- B.
Coccus
- C.
Spirillum
- D.
Vibrio
Correct Answer
C. SpirillumExplanation
The letter E in the question refers to a specific bacteria morphology. Among the given options, Spirillum is the correct answer because it is a type of bacteria that has a spiral or helical shape. Bacillus refers to bacteria that have a rod-like shape, Coccus refers to bacteria that are spherical, and Vibrio refers to bacteria that have a curved or comma-like shape. Therefore, Spirillum is the most appropriate choice for the bacteria morphology represented by letter E.Rate this question:
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- 19.
What bacteria morphology is letter G?
- A.
Bacillus
- B.
Coccus
- C.
Spirillum
- D.
Spirochaete
Correct Answer
D. SpirochaeteExplanation
Spirochaetes are a type of bacteria that have a spiral or corkscrew shape. They are characterized by long, flexible bodies that allow them to move in a corkscrew-like motion. This morphology is different from the other options - Bacillus, Coccus, and Spirillum - which have different shapes and structures. Therefore, the correct answer for the bacteria morphology represented by letter G is Spirochaete.Rate this question:
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- 20.
What bacteria morphology is letter H?
- A.
Bacillus
- B.
Diplobacillus
- C.
Diplococcus
- D.
Staphylobacillus
- E.
Streptobacillus
Correct Answer
B. DiplobacillusExplanation
The correct answer is Diplobacillus because the term "diplo" refers to a pair or two, and "bacillus" refers to a rod-shaped bacteria. Therefore, Diplobacillus refers to a pair of rod-shaped bacteria.Rate this question:
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- 21.
What is the general shape of the bacteria shown in the image?
- A.
Bacillus
- B.
Coccus
- C.
Helical
- D.
Spirillum
Correct Answer
A. BacillusExplanation
The correct answer is Bacillus. This is because the term "bacillus" refers to a rod-shaped bacterium, which is the general shape observed in the image.Rate this question:
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- 22.
What is the general shape of the bacteria shown in the image?
- A.
Bacillus
- B.
Coccus
- C.
Helical
- D.
Spirillum
Correct Answer
D. SpirillumExplanation
The correct answer is Spirillum because the image shows bacteria that have a spiral shape.Rate this question:
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- 23.
What is the morphology (shape) of the bacteria in the image?
- A.
Coccus
- B.
Diplococcus
- C.
Staphylococcus
- D.
Streptococcus
- E.
Sarcina
Correct Answer
C. StapHylococcusExplanation
The correct answer is Staphylococcus. Staphylococcus bacteria are spherical in shape and form clusters or grape-like structures. This can be seen in the image provided where the bacteria appear as round cells grouped together in clusters.Rate this question:
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- 24.
What number bacterium has a flagellum found in the diagram?
Correct Answer
7 - 25.
What structure found on a bacterial cell that propels the cell by rotating in a whiplike motion is a_____.
Correct Answer
flagellumExplanation
A flagellum is a structure found on a bacterial cell that allows it to move by rotating in a whiplike motion. It acts like a propeller, propelling the cell forward and helping it navigate through its environment. This structure is essential for bacteria to move towards favorable conditions or away from harmful ones. The flagellum is made up of a protein filament that spins like a propeller, powered by a motor embedded in the bacterial cell membrane.Rate this question:
- 26.
What type of bacteriai would you be most likely to find in the human intestinal tract?
Correct Answer
enteric bacteriumExplanation
Enteric bacteria are the most likely type of bacteria to be found in the human intestinal tract. These bacteria are commonly found in the intestines and are adapted to survive in the gastrointestinal environment. They play a crucial role in the digestion process and help in the breakdown of food. Enteric bacteria include various species such as Escherichia coli and Salmonella, which are known to inhabit the intestines of humans. Therefore, the presence of enteric bacteria in the human intestinal tract is expected and normal.Rate this question:
- 27.
Which of the following types of bacteria would you be most likely to find in very salt water?
- A.
Chemoautotroph
- B.
Cyanobacterium
- C.
Halophile
- D.
Thermoacidophile
Correct Answer
C. HalopHileExplanation
Halophiles are a type of bacteria that are most likely to be found in very salty water. They have adapted to survive in high salt concentrations and are capable of thriving in environments such as salt pans, salt lakes, and salt mines. These bacteria have specialized mechanisms to maintain osmotic balance and protect themselves from the damaging effects of salt. They are able to survive and reproduce in extreme saline conditions, making them well-suited for very salty water environments.Rate this question:
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- 28.
_____ bacteria lives in extremely acidic and hot environments.
Correct Answer
thermoacidophileExplanation
Thermoacidophiles are a type of bacteria that thrive in environments with high temperatures and extreme acidity. These organisms have adapted to survive in these harsh conditions by developing specialized enzymes and cell structures that can withstand the acidity and high temperatures. They are commonly found in places such as hot springs, volcanic vents, and acid mine drainage sites. Thermoacidophiles play an important role in various industries, such as mining and bioleaching, and their study can provide insights into the limits of life on Earth and the potential for life on other planets.Rate this question:
- 29.
_____is an outer covering of polysaccharides, protects the cell, and helps to attach to other cells.
- A.
Cell Wall
- B.
Capsule
- C.
Endospore
- D.
Outer Membrane
Correct Answer
B. CapsuleExplanation
A capsule is an outer covering of polysaccharides that serves to protect the cell and helps it attach to other cells. It acts as a barrier against environmental stresses and can also help the cell evade the host immune system. The capsule is often found in bacteria and some fungi, providing an additional layer of defense and promoting cell-cell interactions.Rate this question:
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- 30.
A(n)_____ makes up a fuzzy coat of sticky sugars that allows bacteria to connect to the surface of host cells and tissues.
- A.
Capsule
- B.
Glycocalyx
- C.
Plasmid
- D.
Ribosomes
Correct Answer
B. GlycocalyxExplanation
Glycocalyx is a correct answer because it refers to a fuzzy coat of sticky sugars that allows bacteria to connect to the surface of host cells and tissues. The glycocalyx acts as a protective layer for bacteria and helps them adhere to surfaces, which is important for their survival and colonization in the host. It also plays a role in immune evasion and biofilm formation.Rate this question:
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- 31.
What is the structure located at the end of the Clostridium botulinum is a very resistant structure?
Correct Answer
endosporeExplanation
The structure located at the end of Clostridium botulinum is an endospore. Endospores are highly resistant structures formed by certain bacteria as a way to survive harsh conditions. They are dormant and can withstand extreme temperatures, radiation, and chemicals. In the case of Clostridium botulinum, the endospore allows the bacterium to survive in environments where it may not be able to grow or reproduce. This resilience makes endospores a significant factor in the spread and persistence of certain bacterial infections.Rate this question:
- 32.
Prokaryotes live in certain habitats based on their biochemical abilities. _____ _____ need oxygen to live.
- A.
Aerobes
- B.
Anaerobes
- C.
Facultative Anaerobes
- D.
Obligate Aerobes
- E.
Obligate Anaerobes
Correct Answer
D. Obligate AerobesExplanation
Obligate aerobes are prokaryotes that require oxygen to survive. They have specific biochemical abilities that allow them to utilize oxygen for their metabolic processes. Unlike anaerobes, which cannot survive in the presence of oxygen, obligate aerobes rely on oxygen as their primary electron acceptor for respiration. This means that they need oxygen to generate energy efficiently. Obligate aerobes are commonly found in environments with high oxygen concentrations, such as the surface of the skin, respiratory tracts, and aerobic soil layers.Rate this question:
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- 33.
Clostridium tetani causes the nerve disease called tetanus is a(n)_____ _____.
- A.
Aerobes
- B.
Anaerobes
- C.
Facultative Anaerobes
- D.
Obligate Aerobes
- E.
Obligate Anaerobes
Correct Answer
D. Obligate AerobesExplanation
Clostridium tetani is a bacterium that causes tetanus, a nerve disease. The term "obligate aerobes" refers to organisms that require oxygen for their survival and growth. This means that Clostridium tetani cannot survive or grow in the absence of oxygen. Therefore, the statement that Clostridium tetani is an obligate aerobe is correct because it needs oxygen to survive.Rate this question:
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- 34.
The process by which two living bacterium bind together and transfer genetic information is called a(n)_____.
- A.
Conjugation
- B.
Encapsulation
- C.
Transduction
- D.
Transformation
Correct Answer
A. ConjugationExplanation
Conjugation is the correct answer because it is the process by which two living bacteria bind together and transfer genetic information. During conjugation, a donor bacterium transfers a plasmid or a portion of its DNA to a recipient bacterium through a pilus. This genetic exchange allows for the transfer of beneficial traits, such as antibiotic resistance, between bacteria. Encapsulation refers to the process of surrounding a bacterium with a protective capsule, transduction is the transfer of genetic material through a virus, and transformation is the uptake of free DNA from the environment by a bacterium.Rate this question:
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- 35.
The process by which bacterium takes in DNA from it's outside environment is termed a(n)_____.
- A.
Conjugation
- B.
Encapsulation
- C.
Transduction
- D.
Transformation
Correct Answer
D. TransformationExplanation
Transformation is the process by which a bacterium takes in DNA from its outside environment. During transformation, the bacterium incorporates the foreign DNA into its own genome, allowing it to acquire new genetic traits. This process is important for genetic diversity and adaptation in bacteria. Conjugation involves the transfer of DNA between bacteria through direct cell-to-cell contact. Encapsulation refers to the process of surrounding a bacterium with a protective capsule. Transduction is the transfer of DNA from one bacterium to another by a bacteriophage.Rate this question:
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- 36.
When a virus obtains a small segment (part) of DNA from a host prokaryote, the process is called a(n)_____.
- A.
Conjugation
- B.
Encapsulation
- C.
Transduction
- D.
Transformation
Correct Answer
C. TransductionExplanation
Transduction is the process where a virus acquires a small segment of DNA from a host prokaryote. In this process, the virus infects the host cell and incorporates the host's DNA into its own genetic material. This transfer of genetic material allows the virus to carry the host's DNA to another host cell, resulting in the spread of genetic information.Rate this question:
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- 37.
What is the name of the structure that is involved in bacterial transduction?
- A.
Bacteria
- B.
Fungus
- C.
Mold
- D.
Virus
Correct Answer
D. VirusExplanation
Bacterial transduction is a process in which genetic material is transferred from one bacterium to another by a virus. This process occurs when a bacteriophage (a virus that infects bacteria) infects a bacterium and incorporates bacterial DNA into its own genetic material. When the bacteriophage infects another bacterium, it transfers this bacterial DNA, leading to genetic recombination in the recipient bacterium. Therefore, the correct answer is Virus.Rate this question:
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- 38.
_____ is the scientific study of disease.
Correct Answer
pathologyExplanation
Pathology is the scientific study of disease. It involves examining the causes, mechanisms, and effects of diseases on the body. Pathologists analyze tissue samples, perform autopsies, and conduct laboratory tests to diagnose and understand diseases. They study the progression of diseases, identify risk factors, and develop treatment strategies. By studying pathology, scientists and healthcare professionals gain insights into the nature of diseases, which helps in improving diagnosis, treatment, and prevention methods.Rate this question:
- 39.
An exotoxin is a poison that is secreted by a Gram-positive bacteria.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Exotoxins are toxins that are secreted by both Gram-positive and Gram-negative bacteria. They are proteins released by the bacteria into their surrounding environment, causing damage to host cells and tissues. Therefore, the statement that exotoxins are only secreted by Gram-positive bacteria is incorrect.Rate this question:
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- 40.
A(n) _____ is a poison that is associated with the outer membrane of a Gram-negative bacterium.
- A.
Endotoxin
- B.
Excotoxin
- C.
Mesotoxin
- D.
Posotoxin
Correct Answer
A. EndotoxinExplanation
An endotoxin is a poison that is associated with the outer membrane of a Gram-negative bacterium. Endotoxins are lipopolysaccharides (LPS) found in the cell wall of Gram-negative bacteria. When these bacteria are destroyed or undergo lysis, the endotoxins are released and can cause harmful effects on the host organism. They can trigger inflammatory responses and lead to symptoms such as fever, shock, and organ failure.Rate this question:
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- 41.
A (n) _____ is a disease that can pass from animals to humans.
Correct Answer
zoonosisExplanation
A zoonosis is a disease that can pass from animals to humans. This term is used to describe any infectious disease that can be transmitted between animals and humans. Zoonoses can be caused by bacteria, viruses, parasites, or fungi, and can be transmitted through direct contact with infected animals, consumption of contaminated food or water, or through vectors such as ticks and mosquitoes. Some common examples of zoonotic diseases include rabies, Lyme disease, and avian influenza. It is important to understand and prevent zoonoses to protect both animal and human health.Rate this question:
- 42.
What is the process of harnessing bacteria to recycle compounds called?
- A.
Zoonosis
- B.
Exotoxins
- C.
Biotechnology
- D.
Pathology
- E.
Bioremediation
Correct Answer
E. BioremediationExplanation
Bioremediation is the process of using bacteria to recycle compounds. This process involves the use of microorganisms to break down or remove pollutants from the environment, such as oil spills or contaminated soil. Bacteria are harnessed and utilized to degrade or transform these pollutants into less harmful substances, thus cleaning up the environment. Bioremediation is an important technique in environmental science and plays a significant role in waste management and pollution control.Rate this question:
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- 43.
_____ are Gram-negative, that can often appear helical or corkscrew-shaped bacteria.
- A.
Bacillus
- B.
Coccus
- C.
Spirochaete
- D.
Vibrio
Correct Answer
C. SpirochaeteExplanation
Spirochaetes are a group of Gram-negative bacteria that are known for their helical or corkscrew-shaped appearance. They have a unique structure that allows them to move in a twisting or spiraling motion. This distinguishes them from other bacterial shapes such as bacillus (rod-shaped), coccus (spherical), and vibrio (comma-shaped). Spirochaetes include notable pathogens such as Treponema pallidum, the causative agent of syphilis, and Borrelia burgdorferi, the causative agent of Lyme disease.Rate this question:
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- 44.
Which one of the following bacteria is a spirochete and causes syphilis?
- A.
Clostridium botulinum
- B.
Chlamydia
- C.
Staphylococcus aureus
- D.
Treponema pallidum
- E.
Vibrio cholerae
Correct Answer
D. Treponema pallidumExplanation
Treponema pallidum is a spirochete bacteria that causes syphilis. Spirochetes are spiral-shaped bacteria that have a unique corkscrew-like motion due to their axial filaments. Treponema pallidum is transmitted through sexual contact and can cause a wide range of symptoms, including genital sores, rash, fever, and neurological complications if left untreated. It is an important sexually transmitted infection that can be diagnosed through various laboratory tests and can be treated with antibiotics.Rate this question:
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- 45.
What is the shape of letter C?
- A.
Bacillus
- B.
Coccus
- C.
Strepto
- D.
Staphylo
- E.
Spirilla
Correct Answer
D. StapHylo -
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.jpg "What is the morphology (shape) of the bacteria in the image?")
.jpg "What number bacterium has a flagellum found in the diagram?")
.jpg "_____is an outer covering of polysaccharides, protects the cell, and helps to attach to other cells.")
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