Question 1

The channel protein that accounts for why water can cross a membrane more quickly than expected is

Accepted Answer

A)   ATP synthetase.
B)   aquaporin.
C)   the sodium-potassium pump.
D)   integrin.E) B) and C)
F) A) and C)

Question 2

Study the series of pictures to identify the process as

Accepted Answer

A)   facilitated transport.
B)   active transport.
C)   passive transport.
D)   osmosis.E) All of the above
F) None of the above

Question 3

A 10% glucose solution is placed in the thistle tube. The thistle tube is placed in a beaker that contains a 5% glucose solution. There is a differentially permeable membrane across the broad end of the tube, which is permeable to water but not to the sugar glucose. As diffusion occurs

Accepted Answer

A)   the 10% solution will become more concentrated and the 5% solution will become less concentrated.
B)   both solutions will become more concentrated.
C)   the 10% solution will become less concentrated and the 5% solution will become more concentrated.
D)   both solutions will become less concentrated.E) A) and B)
F) B) and C)

Question 4

A major chemical that regulates the fluidity of animal cell membranes by stiffening the membrane at higher temperatures and preventing the membrane from freezing at lower temperature is

Accepted Answer

A)   cholesterol.
B)   lipid in nature.
C)   a steroid.
D)   All of the choices are correct.E) A) and B)
F) A) and C)

Question 5

Some parasites and disease agents regularly change their identity before our immune system can build up substantial antibodies. How could cells change their chemical identity on a regular basis?

Accepted Answer

A)   Rapid evolution produces mutations.
B)   A new phospholipid bilayer is generated to replace the old layer.
C)   Because the membrane is "set," the cell must reproduce and then the cell with the old membrane must die.
D)   Cells eliminate all surface proteins and present only a naked lipid bilayer.
E)   Different glycolipids and glycoproteins are produced internally and moved into the plasma membrane.F) A) and B)
G) All of the above

Question 6

Which of the following is true with respect to plant cell walls?

Accepted Answer

A)   They contain n-acetylglutamic acid.
B)   They all have secondary cell walls to some extent.
C)   There is a greater amount of cellulose in secondary cell walls than in primary cell walls.
D)   Lignin is found in primary cell walls of plants.E) None of the above
F) A) and D)

Question 7

Which statement is NOT true about the proteins in the plasma membrane?

Accepted Answer

A)   Proteins may be attached to the inner surface of the plasma membrane.
B)   The hydrophobic portion of a protein is embedded within the membrane.
C)   Some peripheral proteins are connected to cytoskeletal filaments.
D)   Integral proteins are responsible for membrane functions.
E)   Glycoproteins contain carbohydrate chains that are oriented toward the inner surface of the membrane.F) C) and E)
G) B) and D)

Question 8

Which is the best definition of active transport?

Accepted Answer

A)   movement of molecules from an area of their higher concentration to an area of their lower concentration
B)   movement of water across a semi permeable membrane from an area of higher water concentration to an area of lower water concentration
C)   movement of molecules from an area of their lower concentration to an area of their higher concentration
D)   movement of water across a semi permeable membrane from an area of lower water concentration to an area of higher water concentration
E)   movement of a substance against its concentration through the release of energy from ATPF) A) and D)
G) C) and D)

Question 9

Sugars and amino acids are carried into the cell by means of

Accepted Answer

A)   facilitated transport.
B)   diffusion.
C)   endocytosis.
D)   exocytosis.E) A) and B)
F) A) and C) A

Question 10

Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane.

Accepted Answer

A) True 
 B)False  True

Question 11

Which of the following protein functions is not correctly associated with the correct integral protein?

Accepted Answer

A)   carrier proteins-facilitate passage of molecules through the membrane
B)   enzymatic proteins-catalyze a specific reaction
C)   channel proteins-block the activity of carrier proteins
D)   cell recognition proteins-recognize pathogensE) B) and C)
F) A) and D)

Question 12

Is this cell an animal or plant cell? In what type of environment is this cell found? Is there a net movement of water into or out of the cell? Explain your answer.

Accepted Answer

This is a plant cell in a hype...

Question 13

Active transport

Accepted Answer

A)   requires an input of ATP.
B)   is involved in diffusion.
C)   occurs in osmosis and facilitated transport.
D)   All of the choices are correct.E) B) and C)
F) A) and B) A

Question 14

Imagine a person has a genetic disorder that prevents them from producing the protein collagen, what types of cellular issues will they be faced with?

Accepted Answer

A)   The cell will not have the ability to divide properly.
B)   The cell will not have the ability to regulate the movement of molecules through the membrane.
C)   The cell would not be recognized by the body's immune system.
D)   The cell would not have the ability to resist stretching.
E)   All of the choices are plausible.F) A) and C)
G) B) and C)

Question 15

Freshwater protozoans react to a/an _____ environment by removing water through _____.

Accepted Answer

A)   hypertonic, turgor pressure
B)   hypotonic, turgor pressure
C)   isotonic, a contractile vacuole
D)   hypertonic, a contractile vacuole
E)   hypotonic, a contractile vacuoleF) D) and E)
G) A) and B)

Question 16

The process by which a white blood cell or an amoeba engulfs bacteria is called phagocytosis.

Accepted Answer

A) True 
 B)False

Question 17

Why is the energy expended during endocytosis worth it?

Accepted Answer

A)   The cell increases the amount of ATP produced in order to complete endocytosis.
B)   The contents drawn into the cell are isolated from the cytoplasm preventing them from altering the cells function.
C)   The cell expends such a small amount of energy to run endocytosis it doesn't really matter.
D)   There is no energy expenditure during endocytosis.E) A) and B)
F) None of the above

Question 18

Which type of junctions will create a solid barrier to prevent molecules from moving between the cells?

Accepted Answer

A)   gap
B)   desmosomes
C)   tight
D)   plasmodesmataE) A) and D)
F) B) and C)

Question 19

Which of the following is the reason plants wilt if they are watered with a salt solution?

Accepted Answer

A)   to protect the leaves from full exposure to the salt
B)   an increase in turgor pressure
C)   salt weakens the plant cell walls
D)   loss of water due to the salt solution resulting in a decrease in turgor pressureE) All of the above
F) B) and D)

Question 20

An extracellular matrix helps some cells to adhere to neighboring cells.

Accepted Answer

A) True 
 B)False

Exam 5: Membrane Structure and Function

The channel protein that accounts for why water can cross a membrane more quickly than expected is

Correct AnswerverifiedShow Answer

Study the series of pictures to identify the process as

Correct AnswerverifiedShow Answer

A 10% glucose solution is placed in the thistle tube. The thistle tube is placed in a beaker that contains a 5% glucose solution. There is a differentially permeable membrane across the broad end of the tube, which is permeable to water but not to the sugar glucose. As diffusion occurs

Correct AnswerverifiedShow Answer

A major chemical that regulates the fluidity of animal cell membranes by stiffening the membrane at higher temperatures and preventing the membrane from freezing at lower temperature is

Correct AnswerverifiedShow Answer

Some parasites and disease agents regularly change their identity before our immune system can build up substantial antibodies. How could cells change their chemical identity on a regular basis?

Correct AnswerverifiedShow Answer

Which of the following is true with respect to plant cell walls?

Correct AnswerverifiedShow Answer

Which statement is NOT true about the proteins in the plasma membrane?

Correct AnswerverifiedShow Answer

Which is the best definition of active transport?

Correct AnswerverifiedShow Answer

Sugars and amino acids are carried into the cell by means of

Correct AnswerverifiedA

Receptor-mediated endocytosis involves the use of specific proteins in the cell membrane.

Correct AnswerverifiedTrue

Which of the following protein functions is not correctly associated with the correct integral protein?

Correct AnswerverifiedShow Answer

Is this cell an animal or plant cell? In what type of environment is this cell found? Is there a net movement of water into or out of the cell? Explain your answer.

Correct AnswerverifiedThis is a plant cell in a hype...View AnswerShow Answer

Active transport

Correct AnswerverifiedA

Imagine a person has a genetic disorder that prevents them from producing the protein collagen, what types of cellular issues will they be faced with?

Correct AnswerverifiedShow Answer

Freshwater protozoans react to a/an _____ environment by removing water through _____.

Correct AnswerverifiedShow Answer

The process by which a white blood cell or an amoeba engulfs bacteria is called phagocytosis.

Correct AnswerverifiedShow Answer

Why is the energy expended during endocytosis worth it?

Correct AnswerverifiedShow Answer

Which type of junctions will create a solid barrier to prevent molecules from moving between the cells?

Correct AnswerverifiedShow Answer

Which of the following is the reason plants wilt if they are watered with a salt solution?

Correct AnswerverifiedShow Answer

An extracellular matrix helps some cells to adhere to neighboring cells.

Correct AnswerverifiedShow Answer

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A

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True

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This is a plant cell in a hype...
View Answer

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A

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Freshwater protozoans react to a/an _ environment by removing water through _.

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