29968236
Description
Quiz by Emily Richards, updated more than 1 year ago
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Created by Emily Richards
about 3 years ago
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Question 1
Question
The citric acid cycle is an example of an amphibolic pathway.
Answer
- True
- False
Question 2
Answer
-
Biotin
-
Coenzyme A
-
Acetyl-CoA
-
Flavin mononucleotide
-
Lipoamide
Question 3
Question
The molecule shown above is a cofactor of:
Answer
-
succinate dehydrogenase
-
citrate synthase
-
alpha-ketoglutarate dehydrogenase
-
succinyl-CoA synthetase
-
pyruvate carboxylase
Question 4
Question
Which one of the following enzymes of the citric acid cycle catalyzes an irreversible step?
Answer
-
isocitrate dehydrogenase
-
succinate dehydrogenase
-
succinyl-CoA synthetase
-
fumarase
-
malate dehydrogenase
Question 5
Question
Which of the following conditions decreases the rate of oxidation of acetyl-CoA by the citric acid cycle?
Answer
-
a low ATP/ADP ratio
-
a low NAD+/NADH ratio
-
a low GTP/GDP ratio
-
a high NAD+/NADH ratio
-
an increase in Ca2+ concentration
Question 6
Question
In eukaryotes the enzymes of the citric acid cycle are found in the cytosol.
Answer
- True
- False
Question 7
Question
The citric acid cycle is an anaerobic pathway.
Answer
- True
- False
Question 8
Question
The only reaction in the citric acid cycle that produces a carbon-carbon bond is catalyzed by citrate synthase.
Answer
- True
- False
Question 9
Question
Which enzyme is unique to the glyoxylate cycle?
Answer
-
malic enzyme
-
malate dehydrogenase
-
isocitrate lyase
-
PEP carboxylase
-
pyruvate carboxylase
Question 10
Question
The only reaction of the citric acid cycle that provides substrate level phosphorylation is catalyzed by:
Answer
-
pyruvate dehydrogenase
-
malate dehydrogenase
-
isocitrate dehydrogenase
-
succinate dehydrogenase
-
succinyl-CoA synthetase
Question 11
Answer
-
biotin
-
coenzyme A
-
FAD
-
flavin mononucleotide
-
lipoamide
Question 12
Question
The molecule shown above is a cofactor of:
Answer
-
succinate dehydrogenase
-
citrate synthase
-
isocitrate dehydrogenase
-
succinyl-CoA synthetase
-
pyruvate carboxylase
Question 13
Question
Which one of the following enzymes of the citric acid cycle catalyzes an irreversible step?
Answer
-
succinyl-CoA synthetase
-
succinate dehydrogenase
-
citrate synthase
-
fumarase
-
malate dehydrogenase
Question 14
Question
In mammalian tissues, isocitrate dehydrogenase is allosterically stimulated by
Answer
-
high ATP/ADP ratio
-
low NAD+/NADH ratio
-
low acetyl CoA/CoA ratio
-
high NAD+/NADH ratio
-
a decrease in Ca2+ concentration
Question 15
Question
In eukaryotes the enzymes of the citric acid cycle are found in the mitochondria.
Answer
- True
- False
Question 16
Question
The citric acid cycle is an anaerobic pathway.
Answer
- True
- False
Question 17
Question
The only reaction in the citric acid cycle that produces substrate level phosphorylation is catalyzed by citrate synthase.
Answer
- True
- False
Question 18
Question
All of the statements below about the glyoxylate pathway are true EXCEPT:
Answer
-
The enzymes of the glyoxylate pathway are found in the glyoxysomes.
-
The glyoxysomes contain all of the enzymes of the citric acid cycle.
-
The glyoxylate pathway allows plants, yeast, and microorganisms to thrive using acetate as the sole carbon source.
-
The glyoxylate pathway bypasses the two oxidative decarboxylation reactions of the citric acid cycle.
-
In the glyoxylate pathway, isocitrate is routed through isocitrate lyase and malate synthase.
Question 19
Question
The anaplerotic reactions associated with the citric acid cycle are a result of:
Answer
-
The use of many of the citric acid cycle intermediates in biosynthesis.
-
The oxidative nature of the citric acid cycle.
-
The decarboxylation reactions of the citric acid cycle.
-
The production of reduced coenzymes.
-
The irreversible nature of three citric acid cycle reactions.
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