Deck 23: Biomolecules: Lipids and Their Metabolism

Question 1

Instructions: Match each of the given terms to a structure from the list below.There is only one correct structure for each term,and structures may be used more than once.

Answer 1

Question 2

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below.
androsterone
Draw major product(s):
CH₃COCl,pyridine

Answer 2

Question 3

Which of the following fatty acids has the highest melting point?

A)lauric acid
B)oleic acid
C)linoleic acid
D)linolenic acid

Answer 3

lauric acid

Question 4

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
grandisol

Question 5

Chemically,these are triacylglycerols,triesters of glycerol with three long-chain carboxylic acids.

A)waxes
B)fats and oils
C)fatty acids
D)soaps

Question 6

Cell membranes,which form an effective barrier to the passage of ions and other components into and out of the cell,are:

A)fatty acid esters
B)tricacylglycerols
C)lipid bilayers
D)micelles

Question 7

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below.
androsterone
Draw major product(s):
NaBH₄,ethanol

Question 8

When soaps disperse in water,the long hydrocarbon tails cluster together in a hydrophobic ball,while the ionic heads on the surface of the cluster stick out into the water.These spherical clusters are called:

A)fatty acid esters
B)triacylglycerols
C)lipid bilayers
D)micelles

Question 9

Which of the following fatty acids has the highest melting point?

A)lauric acid
B)myristic acid
C)palmitic acid
D)stearic acid

Question 10

Which of the following is not true about cholesterol?

A)a steroid
B)a precursor for other steroids
C)produced from lanosterol
D)geometry allows for ring-flips
E)all of these are true

Question 11

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
a-santonin

Question 12

Instructions: Draw the structures of the major organic product(s)you would expect to obtain from reaction of androsterone with the reagents listed below.
androsterone
Draw major product(s):

Question 13

Which of the following processes is used to harden an oil to give a fat?

A)oxidation
B)hydrogenation
C)hydrolysis
D)hydration

Question 14

Progesterone and progestin are examples of:

A)androgens
B)estrogens
C)progestins
D)glucocorticoids

Question 15

Which of the following would be expected to be found in higher concentration in butter versus olive oil?

A)CH₃(CH₂)₁₂CO₂H
B)CH₃(CH₂)₇CHCH(CH₂)₇CO₂H
C)CH₃(CH₂)₄(CHCHCH₂)₂(CH₂)₆CO₂H
D)CH₃(CH₂)₄(CHCHCH₂)₄(CH₂)₂CO₂H

Question 16

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
abietic acid

Question 17

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
lineatin

Question 18

Which of the following would function in a regulatory capacity?

A)aldosterone
B)androsterone
C)norethindrone
D)estradiol

Question 19

The major lipid components of cell membranes are:

A)sphingolipids
B)fatty acids
C)phosphoglycerides
D)terpenoids

Question 20

Instructions: Indicate by asterisks the stereogenic centers present in each of the indicated terpenes in the following question(s).
Place asterisks:
linalool

Question 21

Draw the product of the following reaction,which is involved in the catabolism of triacylglycerols.

Question 22

The following sequence represents the steps in the biosynthesis of fatty acids.

Question 23

All of the following describe b-oxidation,except:

A)Two-carbon units are eliminated during each cycle.
B)The process employs NAD⁺ as an oxidant.
C)The process is the primary route to fatty acid degradation.
D)The 2-carbon groups are eliminated from the methyl end of the fatty acid.
E)Fatty acids are attached to coenzyme A during the process.

Question 24

The b-oxidation of odd-numbered fatty acids is characterized by direct formation of:

A)Acetyl CoA.
B)Methylmalonyl CoA.
C)Propionyl CoA
D)Succinyl CoA
E)There are no characteristic products in this process.

Question 25

In the sequence of steps shown below for fatty acid biosynthesis,how many cycles must be completed to produce the following species?

Question 26

The source of oxygen for b-oxidation is:

A)CO₂
B)O₂
C)Peroxide
D)Water
E)None of these is the source of oxygen for b-oxidation.

Question 27

How many molecules of acetyl CoA are produced in the catabolism of stearic acid?

Question 28

How many passages through the b-oxidation pathway are required to completely degrade the following fatty acid?
CH₃(CH₂)₁₂CO₂H

Question 29

All of the following are byproducts of b-oxidation,except:

A)Acetyl CoA
B)ADP
C)NADH
D)FADH₂
E)All of these are byproducts of b-oxidation.

Question 30

Which of the following represents a similarity between the b-oxidation pathway and the biosynthesis of fatty acids?

A)identity of the acyl group carriers
B)stereochemistry of reaction intermediates
C)identity of the redox coenzymes
D)involvement of acetyl CoA
E)all of these are similarities

Question 31

Draw the structure of the carbocation intermediate that results from the following step in terpene synthesis.