Question 1

Suppose water moves across a membrane from an area of high water concentration to an area of low water concentration. What is this an example of?

Accepted Answer

A)   both diffusion and osmosis
B)   both osmosis and active transport
C)   both diffusion and endocytosis
D)   both endocytosis and active transportE) A) and C)
F) A) and D)

Question 2

Match each mechanism of cellular transport with its correct definition.
-phagocytosis

Accepted Answer

A)  movement of a molecule from an area of high concentration to an area of lower concentration
B)  cells internalize molecules into a cell by the inward budding of vesicles possessing receptors specific to the molecule being transported
C)  movement of water from a hypotonic solution into a hypertonic solution across a selectively permeable membrane
D)  large particles are enveloped by the cell membrane and internalized
E)  a process in which liquid droplets are ingested by living cellsF) diffusion of molecules across the plasma membrane with the assistance of transport proteinsG) A) and C)
H) C) and F)

Question 3

In an aqueous environment, how are the phospholipids of a membrane arranged?

Accepted Answer

A)   in a single layer
B)   in a bilayer, with the fatty acid tails located at the surface
C)   in a bilayer, but the phospholipids have no specific orientation
D)   in a bilayer, with the polar heads of each layer located at the surfaceE) All of the above
F) A) and C)

Question 4

One component of the cell membrane functions as a selective barrier, and one component has specific functions such as transport, recognizing other cells, and binding to other cells. Which pair of terms refers to these two components, respectively?

Accepted Answer

A)   carbohydrate and nucleic acid
B)   lipid and carbohydrate
C)   protein and carbohydrate
D)   lipid and proteinE) All of the above
F) B) and C)

Question 5

How are simple diffusion and facilitated diffusion similar to each other?

Accepted Answer

A)   They both belong to passive transport.
B)   They both transport through the aid of a transport molecule.
C)   They both require energy.
D)   They both belong to active transport.E) A) and B)
F) C) and D)

Question 6

Carrier proteins share several characteristics with enzymes used to catalyze metabolic reactions. In what ways are carrier proteins and enzymes similar?

Accepted Answer

Both carrier proteins and enzymes are sp...

Question 7

Which of the following is absolutely necessary for diffusion to occur?

Accepted Answer

A)   a phospholipid bilayer
B)   a living cell
C)   a selectively permeable membrane
D)   a concentration gradientE) None of the above
F) All of the above

Question 8

Which environment is ideal for plant cells, and which is best for animal cells?

Accepted Answer

A)   isotonic for plant cells, and hypertonic for animal cells
B)   isotonic for plant cells, and hypotonic for animal cells
C)   hypotonic for plant cells, and isotonic for animal cells
D)   hypotonic for plant cells, and hypertonic for animal cellsE) B) and D)
F) All of the above

Question 9

Which process leads to a net movement of uncharged molecules from a low concentration to a higher concentration?

Accepted Answer

A)   active transport
B)   osmosis
C)   facilitated diffusion
D)   exocytosisE) All of the above
F) None of the above

Question 10

How are facilitated diffusion and active transport different from each other?

Accepted Answer

A)   Active transport requires a transport protein, while facilitated diffusion does not.
B)   Facilitated diffusion requires a transport protein, while active transport does not.
C)   Facilitated diffusion occurs against the gradient, while active transport does not.
D)   Active transport occurs against the gradient, while facilitated diffusion does not.E) B) and D)
F) A) and B)

Question 11

A solution of 65% water, 35% solute is more concentrated with respect to solute than a solution of 70% water, 30% solute.

Accepted Answer

A) True 
 B)False

Question 12

An unknown cell contains cholesterol. What type of cell is it most likely to be?

Accepted Answer

A)   a bacterial cell
B)   a fungal cell
C)   a plant cell
D)   an animal cellE) B) and D)
F) B) and C)

Question 13

Match each mechanism of cellular transport with its correct definition.
-receptor-mediated endocytosis

Accepted Answer

A)  movement of a molecule from an area of high concentration to an area of lower concentration
B)  cells internalize molecules into a cell by the inward budding of vesicles possessing receptors specific to the molecule being transported
C)  movement of water from a hypotonic solution into a hypertonic solution across a selectively permeable membrane
D)  large particles are enveloped by the cell membrane and internalized
E)  a process in which liquid droplets are ingested by living cellsF) diffusion of molecules across the plasma membrane with the assistance of transport proteinsG) A) and C)
H) B) and E)

Question 14

What is responsible for the selective permeability of a cell membrane?

Accepted Answer

A)   the position of cholesterol in the membrane bilayer
B)   the integral proteins of the membrane
C)   the hydrophobic core formed by the phospholipid tails
D)   the hydrophilic end facing the cell exteriorE) B) and C)
F) A) and B)

Question 15

What two processes are involved when eukaryotic cells import and secrete large molecules?

Accepted Answer

A)   exocytosis when importing and diffusion when secreting
B)   exocytosis when importing and endocytosis when secreting
C)   endocytosis when importing and exocytosis when secreting
D)   diffusion when importing and exocytosis when secretingE) B) and C)
F) A) and D)

Question 16

Identify the structures indicated in this drawing of a typical plasma membrane. 
-integral proteins

Accepted Answer

The answer of Identify the structures indicated in this drawing...

Question 17

Which molecules will pass most easily through a cell membrane by diffusion?

Accepted Answer

A)   large, hydrophilic molecules
B)   large, polar molecules
C)   small, hydrophobic molecules
D)   ionic moleculesE) A) and B)
F) B) and D)

Question 18

When do cells undergo exocytosis?

Accepted Answer

A)   when secreting protein and wastes from the cell
B)   when replicating
C)   when ingesting nutrients
D)   when pumping protons down a concentration gradientE) All of the above
F) B) and D)

Question 19

Match each mechanism of cellular transport with its correct definition.
-diffusion

Accepted Answer

A)  movement of a molecule from an area of high concentration to an area of lower concentration
B)  cells internalize molecules into a cell by the inward budding of vesicles possessing receptors specific to the molecule being transported
C)  movement of water from a hypotonic solution into a hypertonic solution across a selectively permeable membrane
D)  large particles are enveloped by the cell membrane and internalized
E)  a process in which liquid droplets are ingested by living cellsF) diffusion of molecules across the plasma membrane with the assistance of transport proteinsG) C) and F)
H) All of the above

Question 20

What should the tonicity of the distilled water be compared to body cells?

Accepted Answer

A)   It should be isotonic to the cells.
B)   It should be hypotonic to the cells.
C)   It should be protonic to the cells.
D)   It should be hypertonic to the cells.E) None of the above
F) B) and D)

Exam 4: Cell Membranes and Signaling

What should the tonicity of the distilled water be compared to body cells?

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How are simple diffusion and facilitated diffusion similar to each other?

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Suppose water moves across a membrane from an area of high water concentration to an area of low water concentration. What is this an example of?

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Match each mechanism of cellular transport with its correct definition. -phagocytosis

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In an aqueous environment, how are the phospholipids of a membrane arranged?

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Carrier proteins share several characteristics with enzymes used to catalyze metabolic reactions. In what ways are carrier proteins and enzymes similar?

Correct AnswerverifiedBoth carrier proteins and enzymes are sp...View AnswerShow Answer

What is responsible for the selective permeability of a cell membrane?

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Which of the following is absolutely necessary for diffusion to occur?

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Identify the structures indicated in this drawing of a typical plasma membrane. -integral proteins

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A solution of 65% water, 35% solute is more concentrated with respect to solute than a solution of 70% water, 30% solute.

Correct AnswerverifiedShow Answer

What two processes are involved when eukaryotic cells import and secrete large molecules?

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Match each mechanism of cellular transport with its correct definition. -receptor-mediated endocytosis

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When do cells undergo exocytosis?

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An unknown cell contains cholesterol. What type of cell is it most likely to be?

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Which process leads to a net movement of uncharged molecules from a low concentration to a higher concentration?

Correct AnswerverifiedShow Answer

One component of the cell membrane functions as a selective barrier, and one component has specific functions such as transport, recognizing other cells, and binding to other cells. Which pair of terms refers to these two components, respectively?

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How are facilitated diffusion and active transport different from each other?

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Match each mechanism of cellular transport with its correct definition. -diffusion

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Which molecules will pass most easily through a cell membrane by diffusion?

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Which environment is ideal for plant cells, and which is best for animal cells?

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Both carrier proteins and enzymes are sp...
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