Question

what is the purpose of fermentation in brewers yeast?
to produce oxygen
to regenerate nad⁺
to make additional glucose
to make lactic acid

Explanation:

Brewer's yeast undergoes fermentation under anaerobic conditions. The key purpose of this process is to regenerate NAD⁺ from NADH, which is needed to continue glycolysis (the only ATP-producing pathway available without oxygen). Fermentation does not produce oxygen, make glucose, or produce lactic acid (yeast produces ethanol instead of lactic acid). Thus, the correct answer is to regenerate NAD⁺.

Answer:

to regenerate NAD⁺