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71 What is the role of cytochrome c reductase in the ETC?

A: To transfer electrons from NADH to CoQ

B: To transfer electrons from CoQ to cytochrome c

C: To transfer electrons from cytochrome c to oxygen

D: To generate ATP

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72 Which of the following is an uncoupler of oxidative phosphorylation?

A: Dinitrocresol

B: Oligomycin

C: Rotenone

D: Cyanide

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73 What is the function of the F0 component in the mitochondria?

A: To generate ATP in the mitochondria

B: To transport NADH from the cytoplasm to the mitochondria

C: To form a proton channel in the inner mitochondrial membrane

D: To synthesize glucose in the liver

Biochemistry MCQ
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74 Which of the following is a heme-containing protein in the ETC?

A: Cytochrome c (Cyt c)

B: Coenzyme Q (CoQ)

C: Flavin mononucleotide (FMN)

D: NADH

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75 What is the function of the glycerol 3-phosphate shuttle?

A: To generate ATP in the mitochondria

B: To transport NADH from the cytoplasm to the mitochondria

C: To transport FADH2 from the mitochondria to the cytoplasm

D: To synthesize glucose in the liver

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76 Which of the following is an inhibitor of Complex I in the ETC?

A: Rotenone

B: Malonate

C: Antimycin

D: Cyanide

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77 What is the function of thermogenin?

A: To generate ATP in the mitochondria

B: To transport NADH from the cytoplasm to the mitochondria

C: To uncouple oxidation from phosphorylation in the mitochondria

D: To synthesize glucose in the liver

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78 Which complex in the ETC is also known as NADH-CoQ reductase?

A: Complex I

B: Complex II

C: Complex III

D: Complex IV

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79 What is the final recipient of electrons in the ETC?

A: Oxygen (O2)

B: Water (H2O)

C: ATP

D: NADH

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80 Which of the following is a mobile electron carrier in the ETC?

A: Coenzyme Q (CoQ)

B: Cytochrome c (Cyt c)

C: Flavin mononucleotide (FMN)

D: All of the above

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