Krebs cycle Mcqs

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What is the Krebs cycle?

a. A process by which glucose is broken down into pyruvate

b. A process by which ATP is produced from glucose

c. A process by which pyruvate is oxidized to produce ATP

d. A process by which acetyl-CoA is oxidized to produce ATP

Answer: d. A process by which acetyl-CoA is oxidized to produce ATP

 

Which one  is the main function of the Krebs cycle?

a. To make  energy in the form of ATP

b. To produce glucose from pyruvate

c. To convert pyruvate to acetyl-CoA

d. To store energy in the form of ATP

Answer: a. To make energy in the form of ATP

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Where does the Krebs cycle occur?

a. In the cytoplasm of the cell

b. In the mitochondria of the cell

c. In the nucleus of the cell

d. In to the endoplasmic reticulum of the cell

Answer: b. In the mitochondria of the cell

 

Which is the first step in the Krebs cycle?

a. Conversion of acetyl-CoA to citrate

b. Conversion of citrate to isocitrate

c. Conversion of isocitrate to α-ketoglutarate

d. Conversion of α-ketoglutarate to succinyl-CoA

Answer: a. Conversion of acetyl-CoA to citrate

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How many molecules of ATP are produced from the Krebs cycle per glucose molecule?

a. 2

b. 4

c. 6

d. 8

Answer: b. 4

 

How many carbon atoms are in acetyl-CoA?

a. 1

b. 2

c. 3

d. 4

Answer: b. 2

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Which enzyme is responsible for the conversion of citrate to isocitrate in the Krebs cycle?

a. Citrate synthase

b. Aconitase

c. Isocitrate dehydrogenase

d. α-ketoglutarate dehydrogenase

Answer: b. Aconitase

 

Which molecule is a byproduct of the conversion of isocitrate to α-ketoglutarate in the Krebs cycle?

a. CO2

b. NADH

c. FADH2

d. ATP

Answer: a. CO2

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Which one  is the final product of the Krebs cycle?

a. ATP

b. Pyruvate

c. NADH

d. FADH2

Answer: d. FADH2

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Which enzyme is responsible for the conversion of α-ketoglutarate to succinyl-CoA in the Krebs cycle?

a. Citrate synthase

b. Aconitase

c. Isocitrate dehydrogenase

d. α-ketoglutarate dehydrogenase

Answer: d. α-ketoglutarate dehydrogenase

 

Which molecule is a byproduct of the conversion of succinyl-CoA to succinate in the Krebs cycle?

a. CO2

b. NADH

c. FADH2

d. ATP

Answer: d. ATP

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Which molecule is the starting material for the Krebs cycle?

a. Glucose

b. Pyruvate

c. Acetyl-CoA

d. NADH

Answer: c. Acetyl-CoA