Question

Q34). Fermentation directly...

A) regenerates NADH from NAD+.
B) regenerates NAD+ from NADH.
C) initiates gluconeogenesis.
D) produces acetyl CoA.

Answer 1

Fermentation directly regenerates NAD+ from NADH through processes like alcoholic and lactic acid fermentation, allowing glycolysis to continue in the absence of oxygen.

Step-by-step explanation:

Fermentation directly regenerates NAD+ from NADH. During glycolysis, NAD+ is converted to NADH as glucose is broken down into pyruvate. In the absence of oxygen, fermentation pathways, such as alcoholic fermentation and lactic acid fermentation, are necessary to convert the NADH back to NAD+ so glycolysis can continue. This process ensures that a small amount of ATP can be produced without oxygen. The regeneration of NAD+ in this process is crucial because it allows glycolysis, the only energy-producing step in fermentation, to proceed. The other options are incorrect because fermentation does not initiate gluconeogenesis, produce acetyl CoA (which is a product of aerobic respiration), nor does it generate NADH.