Question

How many molecules of last electron acceptor in
ETS are required if one molecule of isocitrate is a
substrate during aerobic respiration?
(1) Six
(2) Five
(3) Four
(4) Two​

Answer 1

Four molecules of ‘last electron acceptor’ in ETS are required if one ‘molecule of isocitrate’ is a substrate during ‘aerobic respiration’.

Option: (3)

Explanation:  

• Electron transport system is the final step of release of the ATP from the FAdh2 and NaDPH and these results in the formation of three and two ATP molecules respectively.  

• These electron acceptor in electron transport system is molecular oxygen. This accepts electron and gets reduced to form water.  

• Now for every molecule of isocitrate, there is 4 rounds of electron transport system should go on. As a result four molecules of oxygen is required.

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