CELL RESPIRATION
ANAEROBIC RESPIRATION FERMENTATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1 only
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1 and 2 only
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2 and 3 only
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All 3
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Detailed explanation-1: -So, the correct answer is ‘Glycolysis, Krebs cycle, Electron transport chain’.
Detailed explanation-2: -Fermentation involves the step of glycolysis in respiration, but it does not go through the Kreb’s cycle or the Electron Transport Chain. Therefore there are only 2 net ATP generated, not the net of 32 that come from cellular respiration.
Detailed explanation-3: -Fermentation is another anaerobic (non-oxygen-requiring) pathway for breaking down glucose, one that’s performed by many types of organisms and cells. In fermentation, the only energy extraction pathway is glycolysis, with one or two extra reactions tacked on at the end.
Detailed explanation-4: -It is a three-step process. First, glucose is oxidized by glycolysis, producing two pyruvate molecules. Second, each pyruvate releases carbon dioxide to produce acetaldehyde. Third, acetaldehyde takes the hydrogen ions from NADH, consequently producing ethanol and converting NADH back to NAD+.
Detailed explanation-5: -So, upto pyruvate production, the pathway for glycolysis and fermentation is similar. Hence, for this question, the correct answer is option C. Pyruvate.