Question 1

Imagine a cell needing an essential specific amino acid (one the cell cannot synthesize) .What process could acquire the amino acid most quickly?

Accepted Answer

A)   Phagocytize and digest bacteria, extract the specific amino acid from the residue, and release to the cytoplasm.
B)   Place a transporter protein in the membrane that could carry the amino acid across the membrane.
C)   Use receptor-mediated endocytosis.
D)   Use simple diffusion because the concentration of the needed amino acid will be zero and the gradient will always be maximized.E) A) and B)
F) A) and C)

Question 2

You place some Elodea,an aquarium plant,in a hypertonic solution.The cells of the Elodea

Accepted Answer

A)   begin to hemolyze.
B)   start to burst.
C)   shrink.
D)   undergo plasmolysis.E) C) and D)
F) B) and D)

Question 3

Muscle cells require high concentrations of calcium to function properly.As a result,these cells use ________ transport to move calcium from areas of low concentration outside the cell into the cytoplasm.

Accepted Answer

The answer of Muscle cells require high concentrations of calcium...

Question 4

You observe a vesicle moving toward the plasma membrane from inside a cell.Once it reaches and fuses with the plasma membrane,you will most likely see an example of

Accepted Answer

A)   receptor-mediated endocytosis.
B)   pinocytosis.
C)   phagocytosis.
D)   exocytosis.E) A) and C)
F) All of the above

Question 5

Cell surface receptors of chemical messages are made of

Accepted Answer

A)   protein.
B)   DNA.
C)   lipids.
D)   sugars.E) A) and D)
F) B) and C)

Question 6

Passive carrier proteins

Accepted Answer

A)   bind to phospholipids in the plasma membrane and move them into the cell.
B)   bind to specific external molecules and aid in the formation of vesicles entering the cell.
C)   create tunnels in the plasma membrane through which specific solutes can diffuse.
D)   change shape upon binding to specific external molecules and then release the molecule on the other side of the membrane.E) A) and B)
F) B) and D)

Question 7

A red blood cell is placed in a solution and it begins to shrink.Which of the following describes the solution?

Accepted Answer

A)   hypertonic
B)   isotonic
C)   hypotonic
D)   supertonicE) A) and D)
F) A) and C)

Question 8

You observe a cell in a solution that swells until it bursts.What you have seen is an instance of osmosis in a(n) ________ solution.

Accepted Answer

A)   hypertonic
B)   isotonic
C)   hypotonic
D)   exotonicE) None of the above
F) B) and C)

Question 9

After a sex hormone enters a target cell,it

Accepted Answer

A)   binds to the nucleus.
B)   becomes a signaling protein.
C)   binds to an internal receptor protein.
D)   becomes a gene.E) C) and D)
F) All of the above

Question 10

Active transport requires

Accepted Answer

A)   cellular energy, usually in the form of ATP.
B)   thermal energy from the environment.
C)   hormonal activation of specific protein carriers.
D)   the initial movement of water by osmosis to develop a favorable concentration gradient.E) None of the above
F) All of the above

Question 11

The arrows in the following figure show the movement of water across the cell wall and plasma membrane of a plant cell.  For water to move in the direction indicated,the solution surrounding the cell must be

Accepted Answer

A)   hypertonic.
B)   hypotonic.
C)   isotonic.
D)   selectively impermeable.E) A) and B)
F) All of the above

Question 12

Tight junctions prevent the movement of the extracellular matrix between cells.

Accepted Answer

A) True 
 B)False

Question 13

Plants have hormones.

Accepted Answer

A) True 
 B)False

Question 14

Soon after a certain molecule enters a cell,the cell begins producing a new type of protein.The molecule was probably a

Accepted Answer

A)   receptor molecule.
B)   hydrophilic molecule.
C)   carrier protein.
D)   hydrophobic hormone.E) A) and D)
F) None of the above

Question 15

Passive carrier molecules often require active carrier proteins to provide amino acids for transport.

Accepted Answer

A) True 
 B)False

Question 16

Hikers can detect a dead skunk along a trail long before they actually see it.What process allows the scent of the skunk to be so widely dispersed?

Accepted Answer

A)   osmosis
B)   active transport
C)   diffusion
D)   transductionE) All of the above
F) A) and C)

Question 17

Imagine two solutions separated by a selectively permeable membrane that is impermeable to glucose.On one side of the membrane,solution A contains 10 percent glucose and on the other side,solution B contains 25 percent glucose.Which of the following is true?

Accepted Answer

A)   Solution A is hypertonic relative to solution B.
B)   The concentration of water is greatest in solution B.
C)   Water will move from solution A to solution B.
D)   Glucose will diffuse from solution B to solution A.E) A) and B)
F) A) and C)

Question 18

Hydrophilic signaling molecules

Accepted Answer

A)   move into cells by active transport through carrier protein channels.
B)   bind to cell surface receptors and do not enter cells.
C)   can passively cross the plasma membrane and bind to intracellular receptor proteins.
D)   move directly into the nucleus through carrier proteins that span the distance from the plasma membrane to the nuclear envelope.E) None of the above
F) All of the above

Question 19

Epithelial tissue in animals provides a barrier against the invasion of bacteria into the body.Which of the following is most likely to be responsible for creating a tight enough barrier between cells to prevent the passage of bacteria between them?

Accepted Answer

A)   anchoring junctions
B)   gap junctions
C)   tight junctions
D)   plasmodesmataE) B) and D)
F) A) and C)

Question 20

Animal cells are attached to neighboring cells by all of the following,EXCEPT

Accepted Answer

A)   anchoring junctions.
B)   gap junctions.
C)   tight junctions.
D)   plasmodesmata.E) A) and B)
F) A) and C)

Exam 4: Cell Membranes, Transport, and Communication

Animal cells are attached to neighboring cells by all of the following,EXCEPT

Correct AnswerverifiedShow Answer

A red blood cell is placed in a solution and it begins to shrink.Which of the following describes the solution?

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Passive carrier molecules often require active carrier proteins to provide amino acids for transport.

Correct AnswerverifiedShow Answer

Hikers can detect a dead skunk along a trail long before they actually see it.What process allows the scent of the skunk to be so widely dispersed?

Correct AnswerverifiedShow Answer

Epithelial tissue in animals provides a barrier against the invasion of bacteria into the body.Which of the following is most likely to be responsible for creating a tight enough barrier between cells to prevent the passage of bacteria between them?

Correct AnswerverifiedShow Answer

After a sex hormone enters a target cell,it

Correct AnswerverifiedShow Answer

Tight junctions prevent the movement of the extracellular matrix between cells.

Correct AnswerverifiedShow Answer

Imagine two solutions separated by a selectively permeable membrane that is impermeable to glucose.On one side of the membrane,solution A contains 10 percent glucose and on the other side,solution B contains 25 percent glucose.Which of the following is true?

Correct AnswerverifiedShow Answer

Active transport requires

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Cell surface receptors of chemical messages are made of

Correct AnswerverifiedShow Answer

You place some Elodea,an aquarium plant,in a hypertonic solution.The cells of the Elodea

Correct AnswerverifiedShow Answer

You observe a cell in a solution that swells until it bursts.What you have seen is an instance of osmosis in a(n) ________ solution.

Correct AnswerverifiedShow Answer

Imagine a cell needing an essential specific amino acid (one the cell cannot synthesize) .What process could acquire the amino acid most quickly?

Correct AnswerverifiedShow Answer

Soon after a certain molecule enters a cell,the cell begins producing a new type of protein.The molecule was probably a

Correct AnswerverifiedShow Answer

Hydrophilic signaling molecules

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Muscle cells require high concentrations of calcium to function properly.As a result,these cells use ________ transport to move calcium from areas of low concentration outside the cell into the cytoplasm.

Correct AnswerverifiedShow Answer

Plants have hormones.

Correct AnswerverifiedShow Answer

The arrows in the following figure show the movement of water across the cell wall and plasma membrane of a plant cell. For water to move in the direction indicated,the solution surrounding the cell must be

Correct AnswerverifiedShow Answer

Passive carrier proteins

Correct AnswerverifiedShow Answer

You observe a vesicle moving toward the plasma membrane from inside a cell.Once it reaches and fuses with the plasma membrane,you will most likely see an example of

Correct AnswerverifiedShow Answer

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