Biochemistry Questions and Answers for Campus interviews focuses on “Mitochondrial Genes: Their Origin and the Effects of Mutations”.
1. How many human mitochondrial proteins are encoded in the mitochondrial genome and synthesized within mitochondria?
A. 11
B. 12
C. 13
D. 14
Answer: C
Clarification: 13 human mitochondrial proteins are encoded in the mitochondrial genome and synthesized within mitochondria.
2. How many mitochondrial proteins are encoded in nuclear genes and imported into mitochondria after their synthesis?
A. 600
B. 700
C. 800
D. 900
Answer: D
Clarification: About 900 different mitochondrial proteins are encoded in nuclear genes and imported into mitochondria after their synthesis.
3. What is Mitochondrial DNA?
A. Simple, single stranded linear DNA molecule
B. Simple, single stranded circular DNA molecule
C. Simple, double stranded linear DNA molecule
D. Simple, double stranded circular DNA molecule
Answer: D
Clarification: Mitochondrial DNA (mt DNA. is a simple, double stranded circular DNA molecule.
4. Oxysomes or F0 – F1 particles occur on _____________
A. Inner mitochondrial membrane
B. Chloroplast surface
C. Mitochondrial surface
D. Thylakoids
Answer: A
Clarification: Oxysomes which are also called as F0 – F1 particles are present on the surface of the folded inner mitochondrial membrane.
5. More than what proportion of mitochondrial proteins are coded by nuclear DNA?
A. 95%
B. 50%
C. 10%
D. 40%
Answer: A
Clarification: More than 95% of mitochondrial proteins are coded by nuclear DNA.
6. What is the size of human mitochondrial DNA?
A. 16kb
B. 200kb
C. 2500kb
D. 100kb
Answer: A
Clarification: The size of human mitochondrial DNA is 16kb.
7. What is the size of plant mitochondrial DNA?
A. 16kb
B. 200-2500kb
C. 100- 2550kb
D. 100-2500kb
Answer: B
Clarification: The size of plant mitochondrial DNA is in the range of 200-2500kb.
8. Typically how many copies of DNA is/are there in each mitochondrion?
A. 1
B. 11
C. 10
D. 12
Answer: C
Clarification: Typically 2-10 copies of DNA are there in each mitochondrion.
9. Mitochondrial DNA is one of the best marker tools for population biologists and evolutionary biologists because _____________
A. Absence of genetic recombination in mt-DNA
B. Mitochondrial genes are specific to mt-DNA
C. It can be easily isolated
D. It undergoes spontaneous mutation
Answer: A
Clarification: Mitochondrial DNA is one of the best marker tools for population biologists and evolutionary biologists because of the absence of genetic recombination in mt-DNA.
10. The mechanism of action of cyanide, a mitochondrial toxin, is by inhibiting ____________
A. ATP synthase
B. Succinate dehydrogenase
C. Cytochrome c oxidase
D. NADH dehydrogenase
Answer: C
Clarification: Cyanide inhibits cytochrome c oxidase.
of Biochemistry for Campus Interviews, .