Biochemistry Questions and Answers – Electron-Transfer reactions in Mitochondria

This set of Biochemistry Assessment Questions and Answers focuses on “Electron-Transfer reactions in Mitochondria”.

1. Protein that contains a nucleic acid derivative of riboflavin is called _________
a) Nucleic acid
b) Amino acid
c) Flavoprotein
d) None
View Answer

Answer: c
Explanation: Flavoproteins contain a very tightly, sometimes covalently, bound flavin nucleotide, either FMN or FAD.

2. NADP-linked dehydrogenase catalyzes _________
a) Glucose 6-phosphate+NADP+ ↔ 6-phosphogluconate + NADPH + H+
b) Lactate + NAD+ ↔ pyruvate + NADH + H+
c) Pyruvate + CoA + NAD+ ↔ acetyl-CoA + CO2 + NADH + H+
d) L-Malate + NAD+ ↔ oxaloacetate + NADH + H+
View Answer

Answer: a
Explanation: NADP-linked dehydrogenase catalyzes Glucose 6-phosphate+NADP+ ↔ 6-phosphogluconate + NADPH + H+.

3. A lipid-soluble benzoquinone with a long isoprenoid side chain is?
a) Ubiquinone
b) Cytochrome b
c) Cytochrome c
d) Cytochrome a
View Answer

Answer: a
Explanation: Ubiquinone also known as coenzyme Q is a lipid-soluble benzoquinone with a long isoprenoid side chain.
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4. The only membrane bound enzyme in the citric acid cycle is _________
a) Succinate dehydrogenase
b) NADH dehydrogenase
c) ATP synthase
d) Acyl co-A dehydrogenase
View Answer

Answer: a
Explanation: The only membrane bound enzyme in the citric acid cycle is succinate dehydrogenase.

5. The first step in the β oxidation of fatty acyl co-A is catalyzed by _________
a) Succinate dehydrogenase
b) NADH dehydrogenase
c) ATP synthase
d) Acyl co-A dehydrogenase
View Answer

Answer: d
Explanation: It involves the transfer of electrons from the substrate to the FAD of the dehydrogenase, then to ETF.

6. Complex 1 is also called _________
a) NADH dehydrogenase
b) Succinate dehydrogenase
c) Cytochrome bc1 complex
d) Cytochrome oxidase
View Answer

Answer: a
Explanation: Complex 2 is called succinate dehydrogenase.
Complex 3 is called the cytochrome bc1 complex.
Complex 4 is called cytochrome oxidase.

7. Complex 2 is also called _________
a) NADH dehydrogenase
b) Succinate dehydrogenase
c) Cytochrome bc1 complex
d) Cytochrome oxidase
View Answer

Answer: b
Explanation: Complex 1 is called NADH dehydrogenase.
Complex 3 is called the cytochrome bc1 complex.
Complex 4 is called cytochrome oxidase.
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8. Complex 3 is also called _________
a) NADH dehydrogenase
b) Succinate dehydrogenase
c) Cytochrome bc1 complex
d) Cytochrome oxidase
View Answer

Answer: c
Explanation: Complex 1 is called NADH dehydrogenase.
Complex 4 is called cytochrome oxidase.
Complex 2 is called succinate dehydrogenase.

9. Complex 4 is also called _________
a) NADH dehydrogenase
b) Succinate dehydrogenase
c) Cytochrome bc1 complex
d) Cytochrome oxidase
View Answer

Answer: d
Explanation: Complex IV, also known as cytochrome oxidase, catalyzes the final
step in the mitochondrial electron transport chain and is one of the key regulators of oxidative
phosphorylation.
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10. In mitochondria, hydride ions are removed from substrates by _________
a) NAD-linked dehydrogenases
b) NADP-linked dehydrogenases
c) ATP synthase
d) Succinate dehydrogenases
View Answer

Answer: a
Explanation: In cytosol hydride ions are removed from substrates by NADP-linked dehydrogenases.

Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry Assessment Questions, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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