Fermentation occurs in the absence of oxygen, but O2 is not found in any of the
ID: 78062 • Letter: F
Question
Fermentation occurs in the absence of oxygen, but O2 is not found in any of the reactions of glycolysis or fermentation. So, what drives these reactions at the level of glycolysis and fermentation? A. In the formation of ethanol, acetaldehyde accepts electrons from NADH, regenerating NAD+ B. ATP is synthesized in glycolysis, only if NAD+ is regenerated during fermentation C. Pyruvate donates electrons to NADH in lactic acid fermentation D. NADH synthesized in glycolysis is used to oxidize pyruvate to acetyl CoA during fermentation reactions E. In the formation of ethanol, pyruvate is decarboxylated in a reversible reaction, once oxygen is present again
Explanation / Answer
Answer:
A. In the formation of ethanol, acetaldehyde accepts electrons from NADH, regenerating NAD+
Explanation:
ATP is synthesized in glycolysis, but the ATP synthesis is not dependent on NAD+ regeneration during fermentation
The two NADH then donate electrons and hydrogen atoms to the two pyruvate molecules, producing two lactatemolecules and regenerating NAD+.
NADH synthesized in glycolysis is used to oxidize acetaldehyde to ethnol during fermentation reactions
Glycolysis:
Glucose + 2 ADP + 2 NAD+ ---- 2 pyruvate + 2ATP+ 2NADH
Fermentation:
2 Pyruvate ---- 2 Acetaldehyde + 2CO2
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