Question 1

A fatty acid designated w-3

Accepted Answer

A)   has three double bonds.
B)   is saturated.
C)   has a double bond three carbons from the end of the chain.
D)   has a double bond three carbons from the a-carbon.E) B) and C)
F) None of the above

Question 2

The constant Ktr is the concentration of the molecule being transported at which the transport protein is half-saturated.

Accepted Answer

A) True 
 B)False

Question 3

You have purified a cell membrane and wish to isolate a transport protein from it. Which treatment might you select?

Accepted Answer

A)   Add a detergent.
B)   Change the ionic strength.
C)   React with a protease.
D)   Add phenylisothiocyanate PIT
C)  .E) B) and D)
F) A) and C)

Question 4

Match each lipid with the appropriate function. A) constricts blood vessels
B) synthesis of bacterial cell wall
C) smooth muscle contraction
D) leaf coatings
E) blood clotting
-wax

Accepted Answer

The answer of Match each lipid with the appropriate function....

Question 5

Isoprenoids are lipids which neither contain nor are derived from fatty acids and include

Accepted Answer

A)   steroids.
B)   waxes.
C)   terpenes.
D)   A and C only
E)   A, B, and CF) All of the above
G) B) and E)

Question 6

If the concentration of a solute is the same both inside and outside the cell, what might you expect with regard to its transport by a membrane protein?

Accepted Answer

A)   Since there is no concentration gradient, no transport either in or out of the cell is possible.
B)   Movement of the solute across the membrane could occur and cause accumulated on one side of the membrane by an active transport protein.
C)   The transport protein has been saturated.
D)   The solute must be phosphorylated with a phosphate group from ATP before further transport can occur.E) A) and D)
F) None of the above

Question 7

Bactoprenol synthesis is inhibited by the antibiotic bacitracin. Therefore, it can be used to treat yeast infections.

Accepted Answer

A) True 
 B)False

Question 8

Triacylglycerols are not found in cell membranes because they are

Accepted Answer

A)   amphipathic.
B)   not amphipathic.
C)   not abundant in cells.
D)   charged at biological pH.E) A) and C)
F) B) and C)

Question 9

Match each technique with its purpose." A) separate groups of neutrallipids
B) diacylglycerolseparation based on chain length and degree of unsaturation
C) Lateral movement of proteins in cell membranes
D) Separate fatty acid esters
E) Separate neutrallipids and phospholipids
-HPLC

Accepted Answer

The answer of Match each technique with its purpose." A)...

Question 10

Dietary triacylglycerols are digested as a result of

Accepted Answer

A)   lipase action.
B)   bile salts.
C)   micelle formation.
D)   diffusion and absorption by intestinal cells.
E)   All of the aboveF) B) and E)
G) A) and C)

Question 11

The membrane-spanning portion of a transmembrane protein is almost always a β-strand.

Accepted Answer

A) True 
 B)False

Question 12

A deficiency in the synthesis of sphingomyelins or cerebrosides will most likely result in the improper formation of

Accepted Answer

A)   cell surfaces.
B)   cell to cell communication.
C)   nerve cells.
D)   blood groups.
E)   All of the aboveF) A) and D)
G) D) and E)

Question 13

Match each lipid with the appropriate function. A) constricts blood vessels
B) synthesis of bacterial cell wall
C) smooth muscle contraction
D) leaf coatings
E) blood clotting
-leukotriene D4

Accepted Answer

Question 14

Like plasmologens, sphingolipids are found in relative abundance in

Accepted Answer

A)   bacteria.
B)   plant cells.
C)   nerve cells.
D)   intestinal cells.
E)   All of the aboveF) A) and C)
G) C) and D)

Question 15

Tay-Sachs disease results from

Accepted Answer

A)   a deficiency of GM2.
B)   defective lysosomes.
C)   malfunction of cerebroside metabolism.
D)   the accumulation of GM2.E) A) and D)
F) B) and C)

Question 16

Which statement is not true about G proteins?

Accepted Answer

A)   They are integral membrane proteins.
B)   They are multisubunit proteins consisting of α, β and γ subunits.
C)   They are slowly inactivated by their own GTPase activity.
D)   They act as transducers for hormones.E) A) and B)
F) A) and C)

Question 17

Margarines made from plant oils are healthier, since they are hydrogenated for spreadability.

Accepted Answer

A) True 
 B)False

Question 18

Which statement is false about lipid rafts?

Accepted Answer

A)   Membrane proteins help maintain the integrity of membrane rafts.
B)   They are distributed non-uniformly on the mammal cell surfaces.
C)   They occur mostly on the outer mitochondrial membrane.
D)   They are patches of cholesterol associated with sphingolipids.E) A) and B)
F) A) and D)

Question 19

Match each technique with its purpose." A) separate groups of neutrallipids
B) diacylglycerolseparation based on chain length and degree of unsaturation
C) Lateral movement of proteins in cell membranes
D) Separate fatty acid esters
E) Separate neutrallipids and phospholipids
-cell fusion

Accepted Answer

The answer of Match each technique with its purpose." A)...

Question 20

Determination of the tertiary structure of a membrane protein finds that the outer surface is composed primarily of hydrophobic residues. Which conclusion is most likely from this observation?

Accepted Answer

A)   It is a lipid-anchored membrane protein.
B)   It is an integral protein.
C)   The protein must be involved in passive transport.
D)   The protein can undergo transverse diffusion.E) A) and B)
F) A) and C)

Exam 9: Lipids and Membranes

Match each lipid with the appropriate function. A) constricts blood vessels B) synthesis of bacterial cell wall C) smooth muscle contraction D) leaf coatings E) blood clotting -wax

Correct AnswerverifiedShow Answer

Which statement is not true about G proteins?

Correct AnswerverifiedShow Answer

The membrane-spanning portion of a transmembrane protein is almost always a β-strand.

Correct AnswerverifiedShow Answer

A fatty acid designated w-3

Correct AnswerverifiedShow Answer

You have purified a cell membrane and wish to isolate a transport protein from it. Which treatment might you select?

Correct AnswerverifiedShow Answer

Match each technique with its purpose." A) separate groups of neutrallipids B) diacylglycerolseparation based on chain length and degree of unsaturation C) Lateral movement of proteins in cell membranes D) Separate fatty acid esters E) Separate neutrallipids and phospholipids -HPLC

Correct AnswerverifiedShow Answer

Match each technique with its purpose." A) separate groups of neutrallipids B) diacylglycerolseparation based on chain length and degree of unsaturation C) Lateral movement of proteins in cell membranes D) Separate fatty acid esters E) Separate neutrallipids and phospholipids -cell fusion

Correct AnswerverifiedShow Answer

Which statement is false about lipid rafts?

Correct AnswerverifiedShow Answer

Tay-Sachs disease results from

Correct AnswerverifiedShow Answer

Margarines made from plant oils are healthier, since they are hydrogenated for spreadability.

Correct AnswerverifiedShow Answer

If the concentration of a solute is the same both inside and outside the cell, what might you expect with regard to its transport by a membrane protein?

Correct AnswerverifiedShow Answer

The constant Ktr is the concentration of the molecule being transported at which the transport protein is half-saturated.

Correct AnswerverifiedShow Answer

Dietary triacylglycerols are digested as a result of

Correct AnswerverifiedShow Answer

Like plasmologens, sphingolipids are found in relative abundance in

Correct AnswerverifiedShow Answer

Determination of the tertiary structure of a membrane protein finds that the outer surface is composed primarily of hydrophobic residues. Which conclusion is most likely from this observation?

Correct AnswerverifiedShow Answer

Match each lipid with the appropriate function. A) constricts blood vessels B) synthesis of bacterial cell wall C) smooth muscle contraction D) leaf coatings E) blood clotting -leukotriene D4

Correct AnswerverifiedShow Answer

Triacylglycerols are not found in cell membranes because they are

Correct AnswerverifiedShow Answer

A deficiency in the synthesis of sphingomyelins or cerebrosides will most likely result in the improper formation of

Correct AnswerverifiedShow Answer

Isoprenoids are lipids which neither contain nor are derived from fatty acids and include

Correct AnswerverifiedShow Answer

Bactoprenol synthesis is inhibited by the antibiotic bacitracin. Therefore, it can be used to treat yeast infections.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The constant K_tris the concentration of the molecule being transported at which the transport protein is half-saturated.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Match each lipid with the appropriate function. A) constricts blood vessels B) synthesis of bacterial cell wall C) smooth muscle contraction D) leaf coatings E) blood clotting -leukotriene D₄

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified