Question

question 10
1 pts
the purpose of alcohol fermentation in yeast cells is to:
regenerate adp
regenerate rubp
regenerate nadp+
produce co₂
regenerate nad+

Explanation:

Alcohol fermentation in yeast cells occurs when oxygen is limited. Glycolysis produces \(NADH\). To continue glycolysis (which is essential for ATP production), \(NAD^+\) (used in glycolysis as an electron acceptor) needs to be regenerated. In alcohol fermentation, the electrons from \(NADH\) are transferred to pyruvate (first converted to acetaldehyde) to regenerate \(NAD^+\).

• Regenerating ADP: ADP is regenerated from ATP during energy - using reactions in general cell metabolism, not the main purpose of alcohol fermentation.
• Regenerating RuBP: RuBP (Ribulose - 1,5 - bisphosphate) is involved in the Calvin cycle (photosynthesis), not alcohol fermentation.
• Regenerating \(NADP^+\): \(NADP^+\) is involved in photosynthesis (e.g., in the light - dependent reactions for \(NADPH\) production), not alcohol fermentation.
• Producing \(CO_2\): While \(CO_2\) is a by - product of alcohol fermentation (from the decarboxylation of pyruvate to acetaldehyde), the main purpose is \(NAD^+\) regeneration for continued glycolysis.

Answer:

regenerate \(NAD^+\)