Test Your Knowledge About Membrane Biology! Trivia Questions Quiz
The quiz below is designed to Test Your Knowledge about Membrane Biology! The membrane is the outer covering of a cell and it is in charge of bringing material in and out of the cell and protects the cell from the outer environment. Do take up the quiz and get to see what more you will get to learn about the cell membrane.
- 1.
What is the current model of cell membranes?
- A.
Extracellular model
- B.
Phospholipid model
- C.
Cellular model
- D.
Fluid-mosaic model
Correct Answer
D. Fluid-mosaic modelExplanation
The correct answer is the fluid-mosaic model. This model describes the structure of cell membranes as a fluid lipid bilayer with embedded proteins. The lipid bilayer is composed of phospholipids that can move laterally within the membrane, giving it a fluid-like consistency. The mosaic aspect refers to the proteins that are scattered throughout the lipid bilayer, creating a mosaic pattern. This model explains the dynamic nature of cell membranes and how they can selectively allow molecules to enter or exit the cell.Rate this question:
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- 2.
What does the fluid part of the fluid-mosaic model mean?
- A.
Phospholipids move laterally (side to side)
- B.
Phospholipids move longitudinally (up and down)
- C.
Proteins are embedded in the phospholipid bilayer
- D.
Carbohydrates are embedded in the phospholipid bilayer
Correct Answer
A. pHospHolipids move laterally (side to side)Explanation
The fluid part of the fluid-mosaic model refers to the ability of phospholipids to move laterally or side to side within the cell membrane. This movement allows for flexibility and dynamic changes in the membrane structure. The fluidity of the phospholipid bilayer is essential for various cellular processes such as cell signaling, membrane fusion, and protein interactions. It also allows for the distribution of proteins and other molecules within the membrane, contributing to its mosaic-like nature.Rate this question:
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- 3.
What does the mosaic part of the fluid-mosaic model mean?
- A.
Phospholipids move laterally (side to side)
- B.
Phospholipids move longitudinally (up and down)
- C.
Proteins are embedded in the phospholipid bilayer
- D.
Carbohydrates are embedded in the phospholipid bilayer
Correct Answer
C. Proteins are embedded in the pHospHolipid bilayerExplanation
The term "mosaic" in the fluid-mosaic model refers to the arrangement of proteins within the phospholipid bilayer. Proteins are embedded in the phospholipid bilayer, creating a mosaic-like pattern. This means that proteins are dispersed throughout the phospholipid bilayer, with different types of proteins serving various functions such as transport, signaling, and structural support. The fluidity of the phospholipid bilayer allows proteins to move within the membrane, contributing to its dynamic nature.Rate this question:
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- 4.
What can increase fluidity in membranes?
- A.
Cholesterol
- B.
Unsaturated fatty acids
- C.
Saturated fatty acids
- D.
Glucose
- E.
A and B
- F.
A and C
Correct Answer
E. A and BExplanation
Cholesterol and unsaturated fatty acids can both increase fluidity in membranes. Cholesterol helps to maintain the fluidity of the membrane by preventing the fatty acid tails from packing too closely together. Unsaturated fatty acids have double bonds in their carbon chains, which introduces kinks and prevents tight packing, thus increasing the fluidity of the membrane. Both cholesterol and unsaturated fatty acids work together to maintain the proper fluidity of cell membranes.Rate this question:
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- 5.
What are the functions of an embedded protein?
- A.
Transport of polar substances across membrane
- B.
Enzyme activity/sequencing
- C.
Signal transduction/cell communication
- D.
Cell to cell regulation (CCM)
- E.
Intercellular junctions (tight and gap)
- F.
To attach ECM to cell
- G.
A and C
- H.
D and E
- I.
All of the above
- J.
None of the above
Correct Answer
I. All of the aboveExplanation
The functions of an embedded protein include the transport of polar substances across the membrane, enzyme activity/sequencing, signal transduction/cell communication, cell to cell regulation (CCM), intercellular junctions (tight and gap), and attaching the extracellular matrix (ECM) to the cell. Therefore, the correct answer is "All of the above."Rate this question:
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- 6.
What does it mean to be selectively permeable?
- A.
Let anything cross
- B.
Let only certain stuff cross
- C.
Let nothing cross
- D.
None of the above
Correct Answer
B. Let only certain stuff crossExplanation
Being selectively permeable means that only certain substances are allowed to pass through a barrier, while others are not. This can refer to a cell membrane or any other type of barrier. It implies that there is a specific criteria or mechanism in place that determines which substances are permitted to cross, while others are blocked or restricted.Rate this question:
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- 7.
How do non-polar substances cross membrane?
- A.
Easily, go straight through bilayer
- B.
Crosses at the next level
- C.
By going through the protein
- D.
None of the above
Correct Answer
A. Easily, go straight through bilayerExplanation
Non-polar substances can easily cross the membrane by going straight through the bilayer. This is because the lipid bilayer of the membrane is made up of non-polar hydrophobic tails that repel polar molecules but allow non-polar molecules to pass through. Therefore, non-polar substances can diffuse directly through the lipid bilayer without the need for any additional assistance from proteins or other mechanisms.Rate this question:
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- 8.
How do polar substances cross membrane?
- A.
Easily, go straight through bilayer
- B.
Crosses at the next level
- C.
By going through the protein
- D.
None of the above
Correct Answer
B. Crosses at the next levelExplanation
Polar substances cannot easily pass through the hydrophobic lipid bilayer of the cell membrane. Instead, they cross the membrane through specialized protein channels or transporters. These proteins create openings or pores in the membrane that allow polar molecules to pass through. This process is known as facilitated diffusion or active transport, depending on the energy requirement. Therefore, the correct answer is "By going through the protein."Rate this question:
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- 9.
How do ionic substances cross membrane?
- A.
Easily, go straight through bilayer
- B.
Crosses at the next level
- C.
By going through the protein
- D.
None of the above
Correct Answer
C. By going through the proteinExplanation
Ionic substances cannot pass through the lipid bilayer of the membrane easily because they are charged and the bilayer is hydrophobic. Instead, they cross the membrane by going through proteins that are embedded in the membrane. These proteins form channels or transporters that allow the ions to move across the membrane, either by passive diffusion or active transport mechanisms. Therefore, the correct answer is "By going through the protein."Rate this question:
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- 10.
What facilitates the movement of water in a membrane?
- A.
Lipids called aquaporins
- B.
Proteins called aquaporins
- C.
Lipids called hydroglycins
- D.
Proteins called hydroglycins
Correct Answer
B. Proteins called aquaporinsExplanation
Aquaporins are proteins that facilitate the movement of water across cell membranes. These proteins form channels that allow water molecules to pass through, while preventing the passage of other molecules. Lipids, on the other hand, are not directly involved in the movement of water in membranes. Hydroglycins, whether lipids or proteins, are not known to play a role in water transport. Therefore, the correct answer is proteins called aquaporins.Rate this question:
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- 11.
What is diffusion?
- A.
Low to high concentration, passive transport
- B.
Low to high concentration, active transport
- C.
High to low concentration, passive transport
- D.
High to love concentration, active transport
Correct Answer
C. High to low concentration, passive transportExplanation
Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration. This movement occurs passively, meaning it does not require the input of energy. Therefore, the correct answer is "High to low concentration, passive transport."Rate this question:
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- 12.
What is osmosis?
- A.
Active transport of water
- B.
Diffusion of water
- C.
Facilitate diffusion of a protein
- D.
None of the above
Correct Answer
B. Diffusion of waterExplanation
Osmosis is the process of diffusion of water across a semipermeable membrane, from an area of lower solute concentration to an area of higher solute concentration. This movement of water occurs to equalize the concentration of solute on both sides of the membrane. It is a passive process that does not require energy expenditure. Therefore, the correct answer is "Diffusion of water".Rate this question:
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- 13.
What is the hypotonic part of the solution?
- A.
Most water, least other thing
- B.
Least water, most other thing
- C.
Equal water and other thing
- D.
None of the above
Correct Answer
A. Most water, least other thingExplanation
The hypotonic part of the solution refers to the part of the solution that has the highest concentration of water and the lowest concentration of other substances. In this case, the correct answer is "Most water, least other thing." This means that the solution has a higher proportion of water compared to other substances present in it.Rate this question:
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- 14.
What is the hypertonic part of the solution?
- A.
Most water, least other thing
- B.
Least water, most other thing
- C.
Equal water and other thing
- D.
None of the above
Correct Answer
B. Least water, most other thingExplanation
The hypertonic part of the solution refers to the part that has the highest concentration of solutes or other substances compared to water. In this case, the correct answer "Least water, most other thing" suggests that the hypertonic part of the solution contains the least amount of water and the highest concentration of other substances.Rate this question:
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- 15.
What does it mean if a solution is isotonic?
- A.
Most water, least other thing
- B.
Least water, most other thing
- C.
Equal water and other thing
- D.
None of the above
Correct Answer
C. Equal water and other thingExplanation
If a solution is isotonic, it means that the concentration of solutes in the solution is equal to the concentration of solutes in the cell or fluid it is being compared to. In other words, there is an equal amount of water and other substances in the solution. This balance helps to maintain the normal functioning of cells and prevent them from shrinking or swelling due to osmosis.Rate this question:
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- 16.
What is the formula for water potential?
- A.
Psi = Psi W + Psi S
- B.
Psi S = -iCRT
- C.
Psi = Psi P + Psi S
- D.
Psi = -iCRT
Correct Answer
C. Psi = Psi P + Psi SExplanation
The formula for water potential is Psi = Psi P + Psi S. This equation represents the total water potential (Psi) as the sum of the pressure potential (Psi P) and the solute potential (Psi S). The pressure potential is determined by the physical pressure exerted on the water, while the solute potential is influenced by the concentration of solutes in the water. By adding these two components together, the formula provides a comprehensive measure of the water potential.Rate this question:
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- 17.
What does Psi stand for?
- A.
Water potential
- B.
Pressure potential (usually zero)
- C.
Solute potential
- D.
Molar concentration
Correct Answer
A. Water potentialExplanation
Psi stands for water potential, which is a measure of the potential energy of water in a system. It takes into account factors such as pressure potential (usually zero), solute potential, and molar concentration. Water potential is important in understanding the movement of water in plants and other biological systems.Rate this question:
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- 18.
What does Psi P stand for?
- A.
Water potential
- B.
Pressure potential (usually zero)
- C.
Solute potential
- D.
Molar concentration
Correct Answer
B. Pressure potential (usually zero)Explanation
Psi P stands for pressure potential, which is typically zero. Pressure potential is the measure of the physical pressure exerted on a solution, and it can either be positive or negative. In this case, the answer states that the pressure potential is usually zero, indicating that there is no additional physical pressure affecting the solution.Rate this question:
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- 19.
What does Psi S stand for?
- A.
Water potential
- B.
Pressure potential (usually zero)
- C.
Solute potential
- D.
Molar concentration
Correct Answer
C. Solute potentialExplanation
Psi S stands for solute potential. Solute potential is a measure of the effect of solute concentration on the movement of water. It is a component of water potential, which determines the direction and rate of water movement in plants. The solute potential is usually negative and represents the potential energy of water molecules being attracted to solute particles. A higher solute concentration results in a lower solute potential, leading to a decrease in water potential and a decrease in the movement of water.Rate this question:
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- 20.
How do you find Psi S?
- A.
-CRT
- B.
CRT
- C.
-iCRT
- D.
ICRT
Correct Answer
C. -iCRTExplanation
The answer is "-iCRT" because the question is asking for the method or process to find "Psi S." The "-i" prefix indicates that the method involves the use of the imaginary unit "i," which is commonly used in mathematical equations involving complex numbers. Therefore, "-iCRT" suggests that the process involves using complex numbers and the CRT method to find "Psi S."Rate this question:
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- 21.
In Psi S = -iCRT, what is i?
- A.
Ionication constant
- B.
Molar concentration
- C.
Gas Constant (0.0831)
- D.
Temperature in Kelvin
Correct Answer
A. Ionication constant -
- 22.
In Psi S = -iCRT, what is C?
- A.
Temperature in Kelvin
- B.
Ionication constant
- C.
Gas Constant (0.0831)
- D.
Molar concentration
Correct Answer
D. Molar concentrationExplanation
In the equation Psi S = -iCRT, the variable C represents the molar concentration. This equation is known as the van 't Hoff factor equation, which relates the osmotic pressure (Psi S) to various factors including molar concentration (C). The negative sign indicates an inverse relationship between osmotic pressure and molar concentration. Therefore, C in this equation refers to the molar concentration of the solution.Rate this question:
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- 23.
In Psi S = -iCRT, what is R?
- A.
Molar concentration
- B.
Gas constant (0.0831)
- C.
Temperature in Kelvin
- D.
Ionication constant
Correct Answer
B. Gas constant (0.0831)Explanation
The correct answer is the gas constant (0.0831). In the equation Psi S = -iCRT, R represents the gas constant. The gas constant is a constant value that relates the properties of a gas, such as pressure, volume, and temperature. In this equation, R is used to calculate the molar concentration (C) multiplied by the temperature in Kelvin (T) and the ionication constant (i) to determine the value of Psi S.Rate this question:
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- 24.
In Psi S = -iCRT, what is T?
- A.
Temperature in Kelvin
- B.
Molar concentration
- C.
Ionication constant
- D.
Gas constant (0.0831)
Correct Answer
A. Temperature in KelvinExplanation
The equation Psi S = -iCRT is the van't Hoff equation, which relates the change in entropy (ΔS) to the change in temperature (ΔT) for a chemical reaction. In this equation, T represents the temperature in Kelvin. Therefore, the correct answer is Temperature in Kelvin.Rate this question:
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- 25.
How do you get Kelvin?
- A.
Fahrenheit - 273
- B.
Celcius - 273
- C.
Fahrenheit + 273
- D.
Celcius + 273
Correct Answer
D. Celcius + 273Explanation
To convert a temperature from Celsius to Kelvin, you need to add 273. Therefore, the correct answer is Celsius + 273.Rate this question:
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- 26.
What is a pressure potential?
- A.
The amount of pressure that the solution gives off
- B.
Pressure you must apply to prevent water movement
- C.
Pressure you must apply to induce water movement
- D.
How much pressure might be there
Correct Answer
B. Pressure you must apply to prevent water movementExplanation
A pressure potential refers to the pressure that needs to be applied in order to prevent the movement of water. This means that if there is a certain amount of pressure present, it will counteract the movement of water and keep it from flowing.Rate this question:
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- 27.
What happens if you put an animal cell into a hypotonic solution?
- A.
It will lyse (burst) and die
- B.
This is normal, so it will live
- C.
It will shrivel and die
- D.
It will become flaccid (limp), but live
Correct Answer
A. It will lyse (burst) and dieExplanation
When an animal cell is placed in a hypotonic solution, the surrounding solution has a lower concentration of solutes compared to the inside of the cell. This causes water to enter the cell in an attempt to balance the concentration. However, since the cell membrane is not able to expand beyond a certain point, the excessive influx of water causes the cell to swell and eventually burst, leading to its death. Therefore, the correct answer is that the animal cell will lyse (burst) and die.Rate this question:
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- 28.
What happens if you put an animal cell into an isotonic solution?
- A.
It will lyse (burst) and die
- B.
This is normal, so it will live
- C.
It will shrivel and die
- D.
It will become flaccid (limp), but live
Correct Answer
B. This is normal, so it will liveExplanation
When an animal cell is placed in an isotonic solution, the concentration of solutes inside and outside the cell is the same. This means that there is no net movement of water into or out of the cell. As a result, the cell maintains its normal shape and size, and it is able to carry out its normal cellular functions. Therefore, the cell will remain alive in an isotonic solution.Rate this question:
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- 29.
What happens if you put an animal cell into a hypertonic solution?
- A.
It will lyse (burst) and die
- B.
This is normal, so it will live
- C.
It will shrivel and die
- D.
It will become flaccid (limp), but live
Correct Answer
C. It will shrivel and dieExplanation
When an animal cell is placed in a hypertonic solution, the concentration of solutes outside the cell is higher than inside the cell. As a result, water will move out of the cell through osmosis, causing the cell to shrink or shrivel. The loss of water can disrupt the cell's normal functioning and eventually lead to cell death. Therefore, the correct answer is that the animal cell will shrivel and die.Rate this question:
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- 30.
What happens if you put a plant cell into a hypotonic solution?
- A.
It becomes turgid (stiff) which is normal, so it lives
- B.
It becomes flaccid (limp), but lives anyway
- C.
It plasmolyzes and dies
- D.
It bursts (lyses) and dies
Correct Answer
A. It becomes turgid (stiff) which is normal, so it livesExplanation
When a plant cell is placed in a hypotonic solution, which has a lower solute concentration compared to the cell, water enters the cell through osmosis. This influx of water causes the cell to swell and become turgid or stiff. This is a normal response for plant cells and allows them to maintain their shape and function properly. Therefore, the plant cell will continue to live in a hypotonic solution.Rate this question:
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- 31.
What happens if you put a plant cell into an isotonic solution?
- A.
It becomes turgid (stiff) which is normal, so it lives
- B.
It becomes flaccid (limp), but lives anyway
- C.
It plasmolyzes and dies
- D.
It bursts (lyses) and dies
Correct Answer
B. It becomes flaccid (limp), but lives anywayExplanation
When a plant cell is placed in an isotonic solution, it means that the concentration of solutes inside and outside the cell is the same. In this situation, there is no net movement of water into or out of the cell. As a result, the cell does not gain or lose water, causing it to become flaccid or limp. However, the cell is still able to carry out its normal functions and survive.Rate this question:
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- 32.
What happens if you put a plant cell into a hypertonic solution?
- A.
It becomes turgid (stiff) which is normal, so it lives
- B.
It becomes flaccid (limp), but lives anyway
- C.
It plasmolyzes and dies
- D.
It bursts (lyses) and dies
Correct Answer
C. It plasmolyzes and diesExplanation
When a plant cell is placed in a hypertonic solution, the concentration of solutes outside the cell is higher than inside the cell. As a result, water moves out of the cell through osmosis, causing the cell to shrink and lose turgor pressure. Plasmolysis occurs, which is the process of the cytoplasm and cell membrane pulling away from the cell wall. This can lead to cell death as the cell loses its structural integrity and essential functions are disrupted. Therefore, the correct answer is that the plant cell plasmolyzes and dies.Rate this question:
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- 33.
What is facilitated diffusion?
- A.
The diffusion of a substance through a phospholipid bilayer
- B.
The diffusion of water through a protein pore
- C.
The diffusion of water through a phospholipid bilayer
- D.
The diffusion of a substance through a protein pore
Correct Answer
D. The diffusion of a substance through a protein poreExplanation
Facilitated diffusion is the process of passive transport of substances across a cell membrane with the help of specific protein channels or pores. These protein channels allow the movement of specific molecules or ions down their concentration gradient, without requiring energy expenditure by the cell. Therefore, the correct answer for this question is "The diffusion of a substance through a protein pore".Rate this question:
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- 34.
What is active transport?
- A.
Going from low to high concentration, requires ATP
- B.
Going from high to low concentration, requires ATP
- C.
Going from low to high concentration, does not require ATP
- D.
Going from high to low concentration, does not require ATP
Correct Answer
A. Going from low to high concentration, requires ATPExplanation
Active transport is a process in which substances are moved against their concentration gradient, from an area of low concentration to an area of high concentration. This process requires the use of ATP, or adenosine triphosphate, which is the energy currency of cells. ATP provides the energy needed to transport molecules or ions across the cell membrane against their concentration gradient. This allows the cell to maintain a concentration gradient and regulate the movement of substances in and out of the cell.Rate this question:
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- 35.
What is co-transport?
- A.
Transporting from high to low
- B.
2 things being transported at the same time
- C.
Transporting from low to high
- D.
None of the above
Correct Answer
B. 2 things being transported at the same timeExplanation
Co-transport refers to the process of transporting two substances simultaneously across a cell membrane. This mechanism involves the movement of one substance down its concentration gradient, which provides the energy for the transport of the second substance against its concentration gradient. This type of transport is often seen in active transport processes, where the movement of one molecule is coupled with the movement of another molecule. Therefore, the correct answer is "2 things being transported at the same time."Rate this question:
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- 36.
When is co-transport useful?
- A.
To use pumped out H+ ions to get glucose into cell
- B.
To use pumped out H+ ions to get sucrose into cell
- C.
To use pumped out OH- ions to get glucose into cell
- D.
To use pumped out OH- ions to get sucrose into cell
Correct Answer
B. To use pumped out H+ ions to get sucrose into cellExplanation
Co-transport is useful when pumped out H+ ions are used to transport sucrose into the cell. This process involves the coupling of the movement of H+ ions down their concentration gradient with the movement of sucrose against its concentration gradient. The H+ ions provide the energy needed to transport sucrose into the cell.Rate this question:
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- 37.
What is exocytosis?
- A.
Putting stuff outside of the cell
- B.
Bringing stuff into the cell
- C.
A type of bulk transport
- D.
A and C
- E.
B and C
Correct Answer
D. A and CExplanation
Exocytosis is a type of bulk transport in which materials are released from the cell. This process involves the fusion of vesicles containing the materials with the cell membrane, leading to the release of the contents outside of the cell. Therefore, option A, "Putting stuff outside of the cell," and option C, "A type of bulk transport," are both correct explanations for exocytosis.Rate this question:
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- 38.
What is endocytosis?
- A.
Putting stuff outside of the cell
- B.
Bringing stuff into the cell
- C.
A type of bulk transport
- D.
A and C
- E.
B and C
Correct Answer
E. B and CExplanation
Endocytosis is a type of bulk transport that involves bringing substances into the cell. This process allows the cell to take in molecules and particles from the external environment by engulfing them with its cell membrane. Therefore, the correct answer is B and C, as endocytosis involves bringing stuff into the cell and is a type of bulk transport.Rate this question:
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- 39.
What is phagocytosis?
- A.
"Cell eating"
- B.
Taking large chunks of stuff into a cell at one time
- C.
"Cell drinking"
- D.
Take small chunks of stuff into a cell at one time, usually liquid
- E.
A and B
- F.
C and D
Correct Answer
E. A and BExplanation
Phagocytosis is the process by which cells engulf and ingest large particles or chunks of material. This is commonly referred to as "cell eating." Additionally, phagocytosis involves the intake of solid substances rather than liquids. Therefore, the correct answer is A and B, as both options accurately describe phagocytosis.Rate this question:
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- 40.
What is pinocytosis?
- A.
"Cell eating"
- B.
Taking large chunks of stuff into a cell at one time
- C.
"Cell drinking"
- D.
Take small chunks of stuff into a cell at one time, usually liquid
- E.
A and B
- F.
C and D
Correct Answer
F. C and DExplanation
Pinocytosis is the process in which a cell takes in small chunks of stuff, usually liquid, at one time. It is also known as "cell drinking." The correct answer is C and D because both options describe pinocytosis accurately.Rate this question:
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- 41.
What is receptor-mediated endocytosis?
- A.
Taking in large amounts of stuff at a time
- B.
Taking in small amounts of stuff at a time, usually liquid
- C.
Taking in small amounts of stuff that the protein receptors select
- D.
None of the above
Correct Answer
C. Taking in small amounts of stuff that the protein receptors selectExplanation
Receptor-mediated endocytosis is a process by which cells selectively take in small amounts of substances that are recognized and bound by specific protein receptors on the cell surface. This process allows the cell to internalize specific molecules or particles, such as hormones, enzymes, or nutrients, that are necessary for its functioning. The substances that are taken in can be in various forms, including liquids, but the key characteristic is that they are selectively chosen by the protein receptors on the cell surface.Rate this question:
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Feb 29, 2016Quiz Created by
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