Question 1

Which of the following lipids is not found in biological membranes?

Accepted Answer

A)   triacylglycerols
B)   phosphoacylglycerols
C)   glycolipids
D)   cholesterolE) C) and D)
F) All of the above

Question 2

Which of the following best describes lipids' insolubility in water?

Accepted Answer

A)   They are typically very soluble.
B)   They are typically insoluble.
C)   There is no general trend as to lipids' solubility in water.D) None of the above
E) A) and B)

Question 3

Glycolipids are characterized by containing the following non-lipid component:

Accepted Answer

A)   Sugars
B)   Glycerol
C)   Phosphate
D)   Sphingosine
E)   More than one of these characterize glycolipids.F) A) and C)
G) D) and E)

Question 4

In the fluid mosaic model of membrane structure

Accepted Answer

A)   the proteins are specifically bonded to the lipids
B)   the proteins "float" in the lipid bilayer
C)   the proteins are sandwiched between the lipid molecules
D)   the lipids are sandwiched between the protein moleculesE) A) and C)
F) A) and B)

Question 5

Transport of a compound across a cell membrane (down a concentration gradient)  was measured at several concentrations. The presence or absence of ATP had no effect on the transport of this compound. Which best describes the mechanism of transport?

Accepted Answer

A)   facilitated diffusion
B)   passive diffusion
C)   primary active transport
D)   secondary active transport
E)   proton pumpingF) A) and E)
G) A) and C)

Question 6

Which of the following is not a characteristic of most fatty acids?

Accepted Answer

A)   Presence of trans double bonds.
B)   Even number of carbon atoms.
C)   Only one carboxyl ( − COOH)  group.
D)   Absence of conjugated double bonds.
E)   All of these characterize lipids.F) C) and D)
G) B) and E)

Question 7

In the sodium-potassium pump

Accepted Answer

A)   sodium is transported out of the cell and potassium into the cell, both against concentration gradients
B)   sodium is transported into the cell and potassium out of the cell, both against concentration gradients
C)   sodium is transported out of the cell and potassium into the cell, both in the same direction as concentration gradients
D)   sodium and potassium are both transported out of the cell against concentration gradientsE) A) and B)
F) B) and D)

Question 8

The freeze-fracture technique of electron microscopy is useful in studying membrane structure because

Accepted Answer

A)   integral membrane proteins can be seen in association with one leaflet of the lipid bilayer
B)   all the proteins can be removed from the membrane
C)   the degree of order of the lipid bilayer can be determined
D)   the presence of bound carbohydrates can be detectedE) B) and C)
F) None of the above

Question 9

These two lipid vitamins are often found in membranes:

Accepted Answer

A)   A and D
B)   A and E
C)   D and E
D)   E and K
E)   None of these is the correct pair.F) C) and D)
G) A) and B)

Question 10

Fatty acids with multiple double bonds are usually conjugated.

Accepted Answer

A) True 
 B)False

Question 11

The vitamin classified as fat soluble rather than water soluble is

Accepted Answer

A)   vitamin A
B)   vitamin B1
C)   vitamin B6
D)   vitamin CE) A) and C)
F) A) and B)

Question 12

Which of the following four fatty acids has the highest melting point?
1)  CH3CH2CH2CH2CH2COOH
2)  CH3CH2CH2CH2CH2CH2CH2CH 2CH2COOH
3)  CH3CH2CH2CH2CH2CH2CH2COOH
4)  CH3CH=CHCH2CH2COOH

Accepted Answer

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

Question 13

Liposomes are

Accepted Answer

A)   artificial membrane-bounded structures used to deliver medications.
B)   single-layered membranes.
C)   mixed micelles involved in cholesterol transport among cells.
D)   bilayers with the hydrophobic regions on the outside.E) A) and C)
F) A) and B)

Question 14

The distribution of lipids in membranes is

Accepted Answer

A)   uneven, with bulkier molecules on the exterior
B)   characterized by even distribution of molecules
C)   distinguished by the absence of cholesterol
D)   not well understoodE) A) and D)
F) A) and C)

Question 15

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) All of the above
G) A) and D)

Question 16

The HDL class of lipoprotein is generally believed to be preventative of heart disease.

Accepted Answer

A) True 
 B)False

Question 17

The association of membrane proteins with lipids in the membrane bilayer always involves

Accepted Answer

A)   electrostatic interactions
B)   hydrophobic interactions
C)   covalent linkages
D)   all of the aboveE) C) and D)
F) A) and B)

Question 18

Which of the following is not a lipid-soluble vitamin?

Accepted Answer

A)   Ascorbic Acid
B)   Cholicalciferol
C)   Vitamin K
D)   Retinol
E)   TocopherolF) C) and E)
G) B) and C)

Question 19

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 D)
G) All of the above

Question 20

What distinguishes primary from secondary active transport?

Accepted Answer

A)   The requirement for protein.
B)   The type of linkage to ATP hydrolysis
C)   The number of kinds of molecules or ions transported
D)   The relative direction of transportE) A) and D)
F) B) and C)

Exam 8: Lipids and Proteins Are Associated in Biological Membranes

Fatty acids with multiple double bonds are usually conjugated.

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In the sodium-potassium pump

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What distinguishes primary from secondary active transport?

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Which of the following is not a characteristic of most fatty acids?

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The HDL class of lipoprotein is generally believed to be preventative of heart disease.

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Which of the following best describes lipids' insolubility in water?

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The vitamin classified as fat soluble rather than water soluble is

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In the fluid mosaic model of membrane structure

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The distribution of lipids in membranes is

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Transport of a compound across a cell membrane (down a concentration gradient) was measured at several concentrations. The presence or absence of ATP had no effect on the transport of this compound. Which best describes the mechanism of transport?

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Which of the following lipids is not found in biological membranes?

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Glycolipids are characterized by containing the following non-lipid component:

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The association of membrane proteins with lipids in the membrane bilayer always involves

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These two lipid vitamins are often found in membranes:

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

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The freeze-fracture technique of electron microscopy is useful in studying membrane structure because

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

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Which of the following four fatty acids has the highest melting point? 1) CH3CH2CH2CH2CH2COOH 2) CH3CH2CH2CH2CH2CH2CH2CH 2CH2COOH 3) CH3CH2CH2CH2CH2CH2CH2COOH 4) CH3CH=CHCH2CH2COOH

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Which of the following is not a lipid-soluble vitamin?

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Liposomes are

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Which of the following four fatty acids has the highest melting point? 1) CH₃CH₂CH₂CH₂CH₂COOH 2) CH₃CH₂CH₂CH₂CH₂CH₂CH₂CH ₂CH₂COOH 3) CH₃CH₂CH₂CH₂CH₂CH₂CH₂COOH 4) CH₃CH=CHCH₂CH₂COOH

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