Question 1

The energy for __________ transport comes from the gradient itself. .

Accepted Answer

A)   active
B)   facilitated
C)   passive
D)   pumped
E)   ATP-mediatedF) D) and E)
G) B) and D)

Question 2

Draw a cross-section of a membrane bilayer and a liposome.

Accepted Answer

Bilayers have two lipid layers in which ...

Question 3

Which of the following is true?

Accepted Answer

A)   Membranes are lipid bilayers.
B)   Membrane lipids have both hydrophobic and hydrophilic properties.
C)   Many membranes are electrically polarized.
D)   All of the above.
E)   None of the above.F) A) and B)
G) C) and E)

Question 4

Which of the following membranes would be the most fluid?

Accepted Answer

A)   a bilayer made of lipids with polyunsaturated 18-carbon fatty acids
B)   a bilayer made of lipids with saturated 18-carbon fatty acids
C)   a bilayer made of lipids with saturated 16-carbon fatty acids
D)   a bilayer made of lipids with polyunsaturated 16-carbon fatty acids
E)   All of the above are equivalent in fluidity.F) None of the above
G) A) and C)

Question 5

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________ membrane proteins are embedded in the hydrocarbon chains of membrane lipids.

Accepted Answer

A)  glycolipids
B)  closed biomolecular sheets
C)  lateral diffusion
D)  integral
E)  hydrophobic effectF) acetylsalicylic acid (aspirin) G) waterH) lipid raftI) hydrophobicJ) ionsK) highL) peripheralM) lowN) A) and I)
O) B) and K)

Question 6

Digitalis is a cardiotonic steroid that does not act like a steroid. Instead, its function is to inhibit:

Accepted Answer

A)   the Na+-K+ pump.
B)   fatty acid intake.
C)   calcium channels.
D)   potassium and sodium pores.
E)   dropsy channel.F) B) and C)
G) A) and B)

Question 7

An antiporter and a symporter are examples of:

Accepted Answer

A)   passive diffusion.
B)   primary active transporters.
C)   entropy-driven pores.
D)   an ABC transporter.
E)   a secondary transporter.F) B) and D)
G) B) and C)

Question 8

Most cell membranes are electrically polarized, the inside being _______________ relative to the outside.

Accepted Answer

negative

Question 9

Which of the following helps regulate membrane fluidity in animals?

Accepted Answer

A)   protein
B)   cholesterol
C)   ATP
D)   magnesium ion
E)   None of the above.F) A) and B)
G) A) and C)

Question 10

What are the key biochemical elements for transmembrane-spanning proteins?

Accepted Answer

The amino acids that cross the membrane ...

Question 11

Describe a lipid raft and its potential role in a cell.

Accepted Answer

Lipid rafts are cholesterol-ri...

Question 12

What force(s)  stabilize(s)  the lipid bilayers?

Accepted Answer

A)   van der Waals interactions
B)   electrostatic and hydrogen bonding between the polar heads and surrounding water
C)   covalent bonds between the lipid tails
D)   covalent bonds between the lipids and membrane proteins
E)   A and BF) B) and D)
G) B) and E)

Question 13

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________ has a high permeability through lipid bilayers.

Accepted Answer

A)  glycolipids
B)  closed biomolecular sheets
C)  lateral diffusion
D)  integral
E)  hydrophobic effectF) acetylsalicylic acid (aspirin) G) waterH) lipid raftI) hydrophobicJ) ionsK) highL) peripheralM) lowN) A) and B)
O) A) and G)

Question 14

Why do most phospholipids preferentially form sheets instead of micelles?

Accepted Answer

The two tails in pho...

Question 15

How are lipid bilayers formed? What is the driving force?

Accepted Answer

Bimolecular sheets of lipids form sponta...

Question 16

The low incidence of protein or lipid flip-flop in a membrane preserves:

Accepted Answer

A)   membrane fluidity.
B)   membrane melting temperatures.
C)   membrane asymmetry.
D)   All of the above.
E)   None of the above.F) D) and E)
G) C) and D)

Question 17

An increase in the ratio of saturated to unsaturated fatty acid chains in a membrane _______________ the fluidity of the membrane.

Accepted Answer

The answer of An increase in the ratio of saturated...

Question 18

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________: A complex between cholesterol and membrane phospholipids.

Accepted Answer

A)  glycolipids
B)  closed biomolecular sheets
C)  lateral diffusion
D)  integral
E)  hydrophobic effectF) acetylsalicylic acid (aspirin) G) waterH) lipid raftI) hydrophobicJ) ionsK) highL) peripheralM) lowN) G) and M)
O) K) and M) H

Question 19

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-Lipid biolayers spontaneously form ____________.

Accepted Answer

A)  glycolipids
B)  closed biomolecular sheets
C)  lateral diffusion
D)  integral
E)  hydrophobic effectF) acetylsalicylic acid (aspirin) G) waterH) lipid raftI) hydrophobicJ) ionsK) highL) peripheralM) lowN) A) and L)
O) I) and K) B

Question 20

Draw a bilayer membrane that has both an integral and peripheral protein present.

Accepted Answer

The membrane should be depicted as a bil...

Exam 12: Membrane Structure and Function

The energy for __________ transport comes from the gradient itself. .

Correct AnswerverifiedShow Answer

Draw a cross-section of a membrane bilayer and a liposome.

Correct AnswerverifiedBilayers have two lipid layers in which ...View AnswerShow Answer

Which of the following is true?

Correct AnswerverifiedShow Answer

Which of the following membranes would be the most fluid?

Correct AnswerverifiedShow Answer

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________ membrane proteins are embedded in the hydrocarbon chains of membrane lipids.

Correct AnswerverifiedShow Answer

Digitalis is a cardiotonic steroid that does not act like a steroid. Instead, its function is to inhibit:

Correct AnswerverifiedShow Answer

An antiporter and a symporter are examples of:

Correct AnswerverifiedShow Answer

Most cell membranes are electrically polarized, the inside being _______________ relative to the outside.

Correct Answerverifiednegative

Which of the following helps regulate membrane fluidity in animals?

Correct AnswerverifiedShow Answer

What are the key biochemical elements for transmembrane-spanning proteins?

Correct AnswerverifiedThe amino acids that cross the membrane ...View AnswerShow Answer

Describe a lipid raft and its potential role in a cell.

Correct AnswerverifiedLipid rafts are cholesterol-ri...View AnswerShow Answer

What force(s) stabilize(s) the lipid bilayers?

Correct AnswerverifiedShow Answer

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________ has a high permeability through lipid bilayers.

Correct AnswerverifiedShow Answer

Why do most phospholipids preferentially form sheets instead of micelles?

Correct AnswerverifiedThe two tails in pho...View AnswerShow Answer

How are lipid bilayers formed? What is the driving force?

Correct AnswerverifiedBimolecular sheets of lipids form sponta...View AnswerShow Answer

The low incidence of protein or lipid flip-flop in a membrane preserves:

Correct AnswerverifiedShow Answer

An increase in the ratio of saturated to unsaturated fatty acid chains in a membrane _______________ the fluidity of the membrane.

Correct AnswerverifiedShow Answer

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________: A complex between cholesterol and membrane phospholipids.

Correct AnswerverifiedH

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -Lipid biolayers spontaneously form ____________.

Correct AnswerverifiedB

Draw a bilayer membrane that has both an integral and peripheral protein present.

Correct AnswerverifiedThe membrane should be depicted as a bil...View AnswerShow Answer

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Bilayers have two lipid layers in which ...
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negative

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The amino acids that cross the membrane ...
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Lipid rafts are cholesterol-ri...
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The two tails in pho...
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Bimolecular sheets of lipids form sponta...
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verified

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H

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B

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The membrane should be depicted as a bil...
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