Question

Describe how NAD is regenerated in anaerobic respiration in yeast cells. (1)

a) NAD is not regenerated in anaerobic respiration; it is permanently depleted.
b) NAD is regenerated through the electron transport chain.
c) NAD is regenerated by converting pyruvate into ethanol.
d) NAD is regenerated by absorbing oxygen.

Answer 1

NAD is regenerated in anaerobic respiration in yeast cells by converting pyruvate into ethanol through fermentation, allowing glycolysis to continue.

Step-by-step explanation:

In anaerobic respiration in yeast cells, NAD is regenerated by converting pyruvate into ethanol. This process is a type of fermentation that allows the oxidation of NADH back into NAD+, ensuring that glycolysis can continue in the absence of oxygen.

It's important to note that during this fermentation process, no additional ATP is produced, which distinguishes it from aerobic respiration where the electron transport chain produces ATP.