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Question

The energy releasing metabolic process in which substrate is oxidized without an external electron acceptor is called   a)aerobic respiration  b)photorespiration  c) glycolysis  d) fermentation  please explain the answer 


Solution

The correct answer is b) Fermentation

Fermentation process  consumes NADH2and e- acceptor is not used, rather released as NAD+. While glycolysis uses external e- acceptor as NAD+. Although fermentation also starts with glycolysis but at the end of fermentation process NAD+ is regenerated for next round of glycolysis.​ 

Glycolysis is itself a part of aerobic respiration and so external electron acceptor is also used in aerobic respiration. Photorespiation occurs in plants, which is not like normal respiratory process in which energy is released.

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