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.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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