To reduce one molecule of O2 _ _ _ electron(s) must be passed through the electron transport chain and _ _ _ molecule(s) of NADH ls(are) oxidized.

Correct answer: D. 4:2

A. 1:1
B. 4:4
C. 1:2
D. 4:2

Explanation

For every 2 electrons carried by respiratory electron chain, one molecule of NADH is oxidized. This gives a ratio of 2:1. Here, four electrons will pass through the chain. So, 2 molecules of NADH will be oxidized which makes option D correct.

Last updated 1 September 2026

To reduce one molecule of O2 _ _ _ electron(s) must be passed through the electron transport chain and _ _ _ molecule(s) of NADH ls(are) oxidized.

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