29968236
Descrição
Quiz por Emily Richards, atualizado more than 1 year ago
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Criado por Emily Richards
aproximadamente 3 anos atrás
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Questão 1
Questão
The citric acid cycle is an example of an amphibolic pathway.
Responda
- True
- False
Questão 2
Responda
-
Biotin
-
Coenzyme A
-
Acetyl-CoA
-
Flavin mononucleotide
-
Lipoamide
Questão 3
Questão
The molecule shown above is a cofactor of:
Responda
-
succinate dehydrogenase
-
citrate synthase
-
alpha-ketoglutarate dehydrogenase
-
succinyl-CoA synthetase
-
pyruvate carboxylase
Questão 4
Questão
Which one of the following enzymes of the citric acid cycle catalyzes an irreversible step?
Responda
-
isocitrate dehydrogenase
-
succinate dehydrogenase
-
succinyl-CoA synthetase
-
fumarase
-
malate dehydrogenase
Questão 5
Questão
Which of the following conditions decreases the rate of oxidation of acetyl-CoA by the citric acid cycle?
Responda
-
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
Questão 6
Questão
In eukaryotes the enzymes of the citric acid cycle are found in the cytosol.
Responda
- True
- False
Questão 7
Questão
The citric acid cycle is an anaerobic pathway.
Responda
- True
- False
Questão 8
Questão
The only reaction in the citric acid cycle that produces a carbon-carbon bond is catalyzed by citrate synthase.
Responda
- True
- False
Questão 9
Questão
Which enzyme is unique to the glyoxylate cycle?
Responda
-
malic enzyme
-
malate dehydrogenase
-
isocitrate lyase
-
PEP carboxylase
-
pyruvate carboxylase
Questão 10
Questão
The only reaction of the citric acid cycle that provides substrate level phosphorylation is catalyzed by:
Responda
-
pyruvate dehydrogenase
-
malate dehydrogenase
-
isocitrate dehydrogenase
-
succinate dehydrogenase
-
succinyl-CoA synthetase
Questão 11
Responda
-
biotin
-
coenzyme A
-
FAD
-
flavin mononucleotide
-
lipoamide
Questão 12
Questão
The molecule shown above is a cofactor of:
Responda
-
succinate dehydrogenase
-
citrate synthase
-
isocitrate dehydrogenase
-
succinyl-CoA synthetase
-
pyruvate carboxylase
Questão 13
Questão
Which one of the following enzymes of the citric acid cycle catalyzes an irreversible step?
Responda
-
succinyl-CoA synthetase
-
succinate dehydrogenase
-
citrate synthase
-
fumarase
-
malate dehydrogenase
Questão 14
Questão
In mammalian tissues, isocitrate dehydrogenase is allosterically stimulated by
Responda
-
high ATP/ADP ratio
-
low NAD+/NADH ratio
-
low acetyl CoA/CoA ratio
-
high NAD+/NADH ratio
-
a decrease in Ca2+ concentration
Questão 15
Questão
In eukaryotes the enzymes of the citric acid cycle are found in the mitochondria.
Responda
- True
- False
Questão 16
Questão
The citric acid cycle is an anaerobic pathway.
Responda
- True
- False
Questão 17
Questão
The only reaction in the citric acid cycle that produces substrate level phosphorylation is catalyzed by citrate synthase.
Responda
- True
- False
Questão 18
Questão
All of the statements below about the glyoxylate pathway are true EXCEPT:
Responda
-
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.
Questão 19
Questão
The anaplerotic reactions associated with the citric acid cycle are a result of:
Responda
-
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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