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