Question

ch. 6 quiz (due by 10/21) (**webcam proctoring)
started: oct 21 at 4:05pm
quiz instructions
(see directions above - review on 10/23)
question 10
the purpose of alcohol fermentation in yeast cells is to:
regenerate nadp+
regenerate nad+
regenerate adp
regenerate rubp
produce co₂

Explanation:

Alcohol fermentation is an anaerobic process. In yeast cells, during glycolysis, \(NAD^+\) is reduced to \(NADH\). To continue glycolysis (which is essential for ATP production as it's the only ATP - generating step in anaerobic conditions for yeast in alcohol fermentation), \(NAD^+\) needs to be regenerated. \(NADP^+\) is mainly involved in photosynthesis - related redox reactions (e.g., in the light reactions of photosynthesis). \(ADP\) is regenerated from \(ATP\) during energy - consuming processes, but this is not the key purpose of alcohol fermentation. \(RuBP\) (Ribulose - 1,5 - bisphosphate) is involved in the Calvin cycle (carbon fixation in photosynthesis). While \(CO_2\) is a by - product of alcohol fermentation (\(C_6H_{12}O_6
ightarrow 2C_2H_5OH + 2CO_2\)), the main purpose is to regenerate \(NAD^+\) to keep glycolysis going.

Answer:

regenerate \(NAD^+\)