Question 1

Which structural component of a bile salt is not present in a cholesterol molecule?

Accepted Answer

A)   a hydroxyl group at C-3
B)   a methyl group at C-10
C)   an amide linkage
D)   none of theseE) A) and D)
F) None of the above

Question 2

Which of the following is a function of unsaturated fatty acids in membranes?

Accepted Answer

A)   They provide fluidity to membranes and allow transport of biochemical products.
B)   They provide a site for chemical reactions to occur.
C)   Both of these are functions of unsaturated fatty acids.
D)   None of these are functions of unsaturated fatty acids.E) All of the above
F) A) and D)

Question 3

Which of the following is an adrenocorticoid hormone?

Accepted Answer

A)   aldosterone
B)   cortisol
C)   cortisone
D)   all of theseE) A) and B)
F) C) and D)

Question 4

Which of the following statements is true of pure fats and oils?

Accepted Answer

A)   They have characteristic color but lack odor and taste.
B)   They have characteristic odor but lack color and taste.
C)   They have characteristic taste but lack odor and color.
D)   They are colorless, odorless, and tasteless substances.E) A) and B)
F) A) and C)

Question 5

Which of the following are secondary messengers?

Accepted Answer

A)   prostaglandins
B)   thromboxanes
C)   both prostaglandins and thromboxanes
D)   prostaglandins nor thromboxanesE) A) and B)
F) C) and D)

Question 6

Which of the following is true of all lecithins?

Accepted Answer

A)   They are composed of only saturated fatty acids.
B)   They are composed of only unsaturated fatty acids.
C)   They always have a choline group in carbon 3 of the glycerol backbone.
D)   They always have an unsaturated fatty acid bound to carbon 1 of the glycerol backbone.E) B) and C)
F) A) and D) C

Question 7

Which of the following is a naturally occurring unsaturated fatty acid?

Accepted Answer

A)   lauric acid
B)   palmitic acid
C)   linoleic acid
D)   myristic acidE) A) and B)
F) None of the above C

Question 8

Which of the following statements is true of anabolic steroids?

Accepted Answer

A)   They are illegal in sporting events.
B)   They are effective when taken orally.
C)   They increase muscle mass.
D)   All of these are true.E) All of the above
F) B) and C)

Question 9

How many cyclohexane rings are present in a steroid structure?

Accepted Answer

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

Question 10

Which of the following is a glycolipid?

Accepted Answer

A)   ceramides
B)   endorphins
C)   enkephalins
D)   none of theseE) All of the above
F) B) and C)

Question 11

Which of the following statements is true of trans fats?

Accepted Answer

A)   They are produced by condensation reactions.
B)   They tend to increase serum cholesterol if consumed in large amounts.
C)   They are classified under "generally recognized as safe" compounds.
D)   They are more common than their cis counterparts.E) None of the above
F) B) and C)

Question 12

Why is coconut oil liquid at room temperature (77oF) ?

Accepted Answer

A)   because of the presence of high amounts of unsaturated fatty acids
B)   because of the presence of essential fatty acids
C)   because of the presence of low-molecular-weight saturated fatty acids
D)   because of the presence of high-molecular-weight saturated fatty acidsE) All of the above
F) C) and D) C

Question 13

Which of the following are glycerophospholipids?

Accepted Answer

A)   cephalins
B)   lecithins
C)   phosphatidylinositols
D)   all of theseE) A) and B)
F) A) and C)

Question 14

Examine the following structure.  Which number in the diagram represents the glycerol backbone of this structure?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and B)
G) A) and C)

Question 15

Which of the following lipoproteins have the highest percentage (dry weight)  of triglycerides?

Accepted Answer

A)   chylomicrons
B)   HDLs
C)   LDLs
D)   VLDLsE) B) and C)
F) A) and D)

Question 16

Which hormone inhibits ovulation once an ovum has been fertilized?

Accepted Answer

A)   estradiol
B)   luteinizing hormone
C)   progesterone
D)   none of theseE) A) and B)
F) A) and D)

Question 17

What is the molecular formula of arachidic acid?

Accepted Answer

A)   CH3(CH2) 15COOH
B)   CH3(CH2) 18COOH
C)   CH3(CH2) 10COOH
D)   CH3(CH2) 14COOHE) All of the above
F) A) and D)

Question 18

In which part of the body do cerebrosides primarily occur?

Accepted Answer

A)   the brain
B)   the intestines
C)   bones
D)   skeletal tissuesE) C) and D)
F) A) and D)

Question 19

Which of the following statements is true of the fluid mosaic model of membranes?

Accepted Answer

A)   Membranes have proteins present only on the outer surface.
B)   The complex lipids that make up membranes are distributed evenly.
C)   The fluidity of membranes increases with an increase in unsaturated fatty acids.
D)   It is impossible to determine the degree of fluidity of membranes.E) B) and C)
F) None of the above

Question 20

What is the nature of the cholesterol found in cell membranes?

Accepted Answer

A)   amphipathic
B)   hydrophobic
C)   hydrophilic
D)   amphiproticE) A) and C)
F) B) and C)

Exam 20: Lipids

Which structural component of a bile salt is not present in a cholesterol molecule?

Correct AnswerverifiedShow Answer

Which of the following is a function of unsaturated fatty acids in membranes?

Correct AnswerverifiedShow Answer

Which of the following is an adrenocorticoid hormone?

Correct AnswerverifiedShow Answer

Which of the following statements is true of pure fats and oils?

Correct AnswerverifiedShow Answer

Which of the following are secondary messengers?

Correct AnswerverifiedShow Answer

Which of the following is true of all lecithins?

Correct AnswerverifiedC

Which of the following is a naturally occurring unsaturated fatty acid?

Correct AnswerverifiedC

Which of the following statements is true of anabolic steroids?

Correct AnswerverifiedShow Answer

How many cyclohexane rings are present in a steroid structure?

Correct AnswerverifiedShow Answer

Which of the following is a glycolipid?

Correct AnswerverifiedShow Answer

Which of the following statements is true of trans fats?

Correct AnswerverifiedShow Answer

Why is coconut oil liquid at room temperature (77oF) ?

Correct AnswerverifiedC

Which of the following are glycerophospholipids?

Correct AnswerverifiedShow Answer

Examine the following structure. Which number in the diagram represents the glycerol backbone of this structure?

Correct AnswerverifiedShow Answer

Which of the following lipoproteins have the highest percentage (dry weight) of triglycerides?

Correct AnswerverifiedShow Answer

Which hormone inhibits ovulation once an ovum has been fertilized?

Correct AnswerverifiedShow Answer

What is the molecular formula of arachidic acid?

Correct AnswerverifiedShow Answer

In which part of the body do cerebrosides primarily occur?

Correct AnswerverifiedShow Answer

Which of the following statements is true of the fluid mosaic model of membranes?

Correct AnswerverifiedShow Answer

What is the nature of the cholesterol found in cell membranes?

Correct AnswerverifiedShow Answer

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C

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C

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Why is coconut oil liquid at room temperature (77^oF) ?

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C

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