Question 1

A useful method for studying membrane proteins in place in the membrane is

Accepted Answer

A)   nuclear magnetic resonance
B)   x-ray crystallography
C)   treatment with mercaptoethanol
D)   treatment with detergentsE) None of the above
F) All of the above A

Question 2

Which of the following lipid molecules possess a different fundamental structural make-up from the others?

Accepted Answer

A)   Fatty acids
B)   Cholesterol
C)   Triglycerides
D)   Sphingolipids
E)   GlycolipidsF) B) and C)
G) A) and E)

Question 3

Which of the following is not true?

Accepted Answer

A)   Receptors are often invaginated into the cell after binding to their specific molecule.
B)   A given receptor type is present at a constant level on the outside of a cell
C)   In certain disease states, the level of a given receptor is increased or decreased
D)   Binding of receptors to ligands sometimes shows hyperbolic binding curvesE) A) and D)
F) A) and C)

Question 4

What does amphipathic mean?

Accepted Answer

A)   having both positive and negative charges
B)   having both acid and base properties
C)   having both hydrophilic and hydrophobic regions
D)   having two stereoisomersE) A) and C)
F) A) and D)

Question 5

What characteristic is most used to define lipids?

Accepted Answer

A)   ionic charge
B)   melting point
C)   solubility
D)   ability to bind metal ionsE) A) and B)
F) B) and C)

Question 6

The order-disorder transition (melting)  in membranes

Accepted Answer

A)   is cooperative
B)   can be monitored by fluorescence techniques
C)   can be monitored by spin labeling
D)   all of theseE) A) and B)
F) A) and C)

Question 7

The key reaction of eyesight (in dim light)  involving vitamin A is:

Accepted Answer

A)   Reaction of the protein complex called Rhodopsin.
B)   A cis-trans isomerization of a double bond.
C)   Bleaching of a pigment in the retina.
D)   Reaction of Rhodopsin and cis-trans isomerization of a double bond.
E)   All of these.F) A) and B)
G) A) and E) E

Question 8

Passive transport is the same as:

Accepted Answer

A)   simple diffusion
B)   facilitated diffusion
C)   active transport
D)   primary active transportE) A) and B)
F) A) and D)

Question 9

Which of the following statements concerning active transport is true?

Accepted Answer

A)   It takes place in the same direction as a concentration gradient.
B)   It requires no expenditure of energy by the cell.
C)   It can be compared to water running downhill.
D)   A membrane-associate protein must be involved.E) A) and C)
F) B) and C)

Question 10

Aspirin produces most of its analgesic effects by

Accepted Answer

A)   binding to the plasma membrane of nerve cells
B)   inhibiting the synthesis of vitamin A
C)   inhibiting the synthesis of phospholipids
D)   inhibiting the synthesis of prostaglandinsE) None of the above
F) A) and C) D

Question 11

Plants need cholesterol in their membranes to counteract the rigidity of the cell wall.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following methods of transport across a membrane does not require a protein?

Accepted Answer

A)   Passive transport
B)   Facilitated transport
C)   Active Transport
D)   Simple diffusionE) B) and C)
F) A) and B)

Question 13

With what compound are fatty acids reacted to make a fat or oil?

Accepted Answer

A)   cholesterol
B)   glycerol
C)   sphinganine
D)   ceramideE) B) and D)
F) B) and C)

Question 14

Exhibit 8A  Refer to Exhibit 8A.Protein #2 would most likely function as a:

Accepted Answer

A)   Carrier
B)   Channel
C)   Cell identity
D)   Receptor
E)   You cannot tell from the diagram.F) B) and E)
G) A) and E)

Question 15

Which of the following is true?

Accepted Answer

A)   All fatty acids have an even number of carbons
B)   Most fatty acids have an odd number of carbons
C)   Fatty acids are equally likely to have an even number of carbons as they are an odd number
D)   Fatty acids with an odd number of carbons are more rare than those with an even numberE) A) and C)
F) All of the above

Question 16

Which of the following four fatty acids has the lowest melting point?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and C)
F) B) and D)

Question 17

A major difficulty in extracting receptor proteins from membranes is that

Accepted Answer

A)   it is difficult to remove the proteins from the membrane without denaturation
B)   there may be very few molecules of the protein in a cell
C)   receptor proteins tend to have high molecular weights
D)   all of theseE) B) and D)
F) None of the above

Question 18

How does cholesterol affect membrane fluidity?

Accepted Answer

A)   It tends to increase the fluidity.
B)   It tends to decrease the fluidity.
C)   It doesn't have any specific effect on fluidity.D) A) and B)
E) A) and C)

Question 19

Which of the following is true?

Accepted Answer

A)   Fatty acids with trans double bonds may be particularly unhealthy because they increase the ratio of LDLs to HDLs.
B)   A fatty acid with 14 carbons and one trans double bond will behave more like a saturated fatty acid with 14 carbons than will an unsaturated fatty acid with a cis double bond.
C)   Fatty acids with trans double bonds can be formed by hydrogenation reaction of polyunssaturated fatty acids
D)   fatty acids with trans double bonds tend to have higher melting points than those with cis double bonds all else being equal
E)   All of these are correctF) B) and E)
G) A) and B)

Question 20

The following lipid vitamin is often used to preserve foods from spoiling:

Accepted Answer

A)   A
B)   D
C)   E
D)   K
E)   None of these preserves food.F) A) and E)
G) None of the above

Exam 8: Lipids and Proteins Are Associated in Biological Membranes

A useful method for studying membrane proteins in place in the membrane is

Correct AnswerverifiedA

Which of the following lipid molecules possess a different fundamental structural make-up from the others?

Correct AnswerverifiedShow Answer

Which of the following is not true?

Correct AnswerverifiedShow Answer

What does amphipathic mean?

Correct AnswerverifiedShow Answer

What characteristic is most used to define lipids?

Correct AnswerverifiedShow Answer

The order-disorder transition (melting) in membranes

Correct AnswerverifiedShow Answer

The key reaction of eyesight (in dim light) involving vitamin A is:

Correct AnswerverifiedE

Passive transport is the same as:

Correct AnswerverifiedShow Answer

Which of the following statements concerning active transport is true?

Correct AnswerverifiedShow Answer

Aspirin produces most of its analgesic effects by

Correct AnswerverifiedD

Plants need cholesterol in their membranes to counteract the rigidity of the cell wall.

Correct AnswerverifiedShow Answer

Which of the following methods of transport across a membrane does not require a protein?

Correct AnswerverifiedShow Answer

With what compound are fatty acids reacted to make a fat or oil?

Correct AnswerverifiedShow Answer

Exhibit 8A Refer to Exhibit 8A.Protein #2 would most likely function as a:

Correct AnswerverifiedShow Answer

Which of the following is true?

Correct AnswerverifiedShow Answer

Which of the following four fatty acids has the lowest melting point?

Correct AnswerverifiedShow Answer

A major difficulty in extracting receptor proteins from membranes is that

Correct AnswerverifiedShow Answer

How does cholesterol affect membrane fluidity?

Correct AnswerverifiedShow Answer

Which of the following is true?

Correct AnswerverifiedShow Answer

The following lipid vitamin is often used to preserve foods from spoiling:

Correct AnswerverifiedShow Answer

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A

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E

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D

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