Multiple Choice Questions on Krebs Cycle or Citric Acid Cycle

1. In Kreb’s cycle
a) Energy is stored in the form of ATP
b) Energy is stored in the form of ADP
c) Energy is liberated from ADP
d)  Energy is liberated from ATP

2. In Kreb’s cycle , a six carbon compound is formed by the combination of Acetyl CoA and
a) Citric acid
b) malic acid
c) oxaloacetic acid
d)  succinic acid

3. During one Kreb’s cycle number of carbon dioxide (CO2), molecules released is
a) 1
b) 2
c) 3
d)  4

4. Most enzymes that take part in Kreb’s cycle are located in
a) cytoplasm
b) mitochondrial matrix
c) plasma membrane
d)  inner mitochondrial membrane

5. In Kreb’s cycle GTP is formed in
citric acid cycle
a) Oxidative phosphorylation
b) Substrate level phosphorylation
c) Cyclic photophosphorylation
d)  Non cyclic photophosphorylation

6. Enzymes of TCA cycle or Kreb’s cycle are located in the matrix of mitochondria except one which is located in the inner mitochondrial membrane. Name the enzyme
a) citrate synthase
b) succinate dehydrogenase
c) malate dehydrogenase
d)  α ketoglutarate dehydrogenase

7. In Kreb’s cycle, the hydrogen of malate is accepted by
a) FMN
b) FAD
c) NAD
d)  CoA

8. The TCA cycle is an oxidative pathway requiring oxygen for operation. The enzyme which consumes oxygen during the operation of the cycle is
a) isocitrate dehydrogenase
b) α ketoglutarate dehydrogenase
c) acotinase
d)  none of the above

9. Last electron acceptor in respiration is
a) O2
b) CO2
c) H2
d)  NADH

10. Which is the total yield of ATP in TCA cycle in eukaryotic cells?
a) 30
b) 34
c) 36
d)  38

Learn more:

1. a) Energy is stored in the form of ATP
2. c) oxaloacetic acid
3. b) 2
4. b) mitochondrial matrix
5. b) Substrate level phosphorylation
6. b) succinate dehydrogenase
7. c) NAD
8. d) none of the above
9. a) O2
10. a) 30


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  1. this was such nice mcq test i have ever answered. keep up the good work

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