GATE 2021 ES – Question 18

Environmental Microbiology · Microbial Metabolism · 1 mark · Multiple choice

What is the terminal electron acceptor in aerobic respiration?

Water
NADH
O₂
Cytochrome c

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Correct answer: (C) O₂

Explanation

**O₂,C** accepts electrons at the terminal oxidase and is reduced to water. NADH supplies reducing equivalents upstream, and cytochrome c is an intermediate electron carrier. Water is the reduced product, rather than the terminal acceptor.

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