問題一覧
1
Which of the following statements about digestion of dietary triacylglycerols in adults is correct?
It occurs to a small extent (10%) in the stomach
2
The semi-liquid material chyme is formed in
stomach
3
The major function of bile released during triacylglycerol digestion is to
act as an emulsifier
4
The two major products of triacylglycerol digestion in the small intestine are fatty acids and
monoacylglycerols
5
Lipoproteins that transport triacyglycerols from intestinal cells to the bloodstream are called
chylomicrons
6
Hormone-sensitive lipase needed for triacyglycerol mobilization is activated by
cAMP
7
In triacylglycerol mobilization, triacylglycerol molecules undergo
hydrolysis
8
Which of the following is not a product of triacylglycerol mobilization?
ATP
9
The first stage of glycerol metabolism is a two-step process in which glycerol is converted to
dihydroxyacetone phosphate
10
What is the intermediate compound in the two-step first stage of glycerol metabolism?
glycerol 3-phosphate
11
After the first stage of glycerol metabolism, the remaining stages are the same as
glucose pathways
12
In the oxidation of fatty acids, what two molecules are needed to initially activate a fatty acid molecule?
CoA and ATP
13
In the oxidation of fatty acids, what molecule shuttles activated fatty acid molecules across the inner mitochondrial membrane?
carnitine
14
The correct sequence for the four reactions of the B-oxidation pathway in terms of the "functional group acted upon" is
alkane, alkene, 2° alcohol, ketone
15
The correct sequence for the four reactions of the B-oxidation pathway in terms of the "type of reaction occurring" is
dehydrogenation, hydration, dehydrogenation, thiolysis
16
How many turns of the -oxidation pathway are needed to "process" a C16 saturated fatty acid?
7
17
How many turns of the B-oxidation pathway are needed to "process" a C16 unsaturated fatty acid
7
18
How many acetyl CoA molecules are produced when a C18 fatty acid is completely processed through the B-oxidation pathway?
9
19
How many FADH2 and NADH molecules are produced, respectively, during one turn of the fatty acid B-oxidation pathway?
1 and 1
20
Net ATP production during a B-oxidation process is always 2 less than gross ATP production because ATP is consumed in fatty acid
activation
21
Which of the following is not a ketone body?
no correct response
22
How many of the ketone bodies are C4 molecules?
2
23
How many acetyl CoA molecules are used as reactants in the process of ketogenesis?
3
24
The correct sequence for the four reactions of ketogenesis in terms of the"type of reaction occurring" is
condensation, condensation, cleavage, hydrogenation
25
The characterization C4 + C2 — > C6 applies to which step in the process of ketogenesis?
Step 2
26
How many units of acetyl CoA are produced when an acetoacetyl CoA undergoes cleavage using a thiolase
2
27
The process of lipogenesis occurs in the
cell cytosol
28
The notation ACP stands for
acyl carrier protein
29
Which of the following is the correct characterization for the first step in the first turn of the chain elongation phase of lipogenesis?
C2+ C3 → C4 + C1
30
Steps 2 through 4 of the chain elongation phase of lipogenesis involve, respectively, which of the following reaction sequences?
hydrogenation, dehydration, hydrogenation
31
The reducing agent needed in the process of lipogenesis is
NADPH
32
The carrier of the "two carbon units" used to biosynthesize a fatty acid is
malonyl ACP
33
Which of the following statements concerning the intermediates in lipogenesis and the citric acid cycle is incorrect?
Intermediates in both processes are derivatives of C3 carboxylic acids.
34
The ketoacid intermediates in lipogenesis and the citric acid cycle are, respectively,
acetoacetate and oxaloacetate
35
Which of the following fates for fatty acid-generated acetyl CoA is not possible?
no correct response
36
Which of the following is a correct statement about the biosynthetic pathway for cholesterol synthesis?
It is a multistep process.
37
How many molecules of acetyl CoA are consumed in the production of a cholesterol molecule?
18
38
Acetyl CoA cannot be converted to which of the following molecules?
pyruvate
39
Which of the following substances cannot be converted to pyruvate?
fatty acids
40
Which of the following processes could not be used as a source of acetyl CoA needed for ketone body formation?
lipogenesis
41
Which of the following processes occurs within the cytosol of a cell?
no correct response
42
How many different B vitamins participate in the reactions involved in lipid metabolism?
4
43
Which of the following B-vitamin-containing coenzymes is needed in the reactions associated with the conversion of acetyl CoA to ketone bodies?
NAD+
44
Which of the following B-vitamin-containing coenzymes is needed in the reactions associated with the conversion of fatty acids to acetyl CoA?
FAD