The organelle that is the site of oxidative phosphorylation is: MCQ with Answer and Explanation

The organelle that is the site of oxidative phosphorylation is:
A. Mitochondrion
B. Golgi apparatus
C. Nucleus
D. Ribosome
Answer: Option A
Solution (By JKSSB Mock Tests)
Oxidative phosphorylation occurs on the inner mitochondrial membrane, where the electron transport chain creates a proton gradient, and ATP synthase uses this gradient to produce ATP. This is the major source of cellular energy. Nucleus stores DNA, Golgi processes proteins, ribosomes synthesize proteins.

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Practice More Biology Questions

Question #1
Consider the following statements about DNA fingerprinting:
1. It uses VNTRs (variable number tandem repeats).
2. It can be used in paternity testing.
3. It requires amplification by PCR.
Which of the above is/are correct?
A. 1 and 3 only
B. 1, 2, and 3
C. 2 and 3 only
D. 1 and 2 only

Correct Answer: Option B


Explanation:
DNA fingerprinting analyzes VNTRs, often amplified by PCR, and is used in forensics and paternity. All three are correct.

This question belongs to: Science Biology
Question #2
Which of the following statements about pollination is INCORRECT?
A. Anemophily is pollination by wind.
B. Zoophily involves animals.
C. Entomophily is pollination by insects.
D. Hydrophily occurs in terrestrial plants.

Correct Answer: Option D


Explanation:
Hydrophily is pollination by water and occurs in aquatic plants like Vallisneria and Zostera. Terrestrial plants do not use water for pollination. All other statements are correct.

This question belongs to: Science Biology
Question #3
The scientist who discovered the enzyme reverse transcriptase was:
A. James Watson
B. Francis Crick
C. Howard Temin and David Baltimore
D. Kary Mullis

Correct Answer: Option C


Explanation:
Howard Temin and David Baltimore independently discovered reverse transcriptase in retroviruses in 1970, an enzyme that synthesizes DNA from RNA. Watson and Crick DNA structure, Mullis PCR.

This question belongs to: Science Biology