Which of the following accurately describes fermentation?
a. fermentation generates more atp than cellular respiration.
b. fermentation always produces carbon dioxide.
c. fermentation makes nad+ needed to keep glycolysis going.
d. fermentation can only occur in the presence of oxygen.

The right answer is C

In the anaerobic mode, the reduction of pyruvate to lactate or ethanol (fermentations) ensures the reoxidation of NADH to NAD + consumed during the oxidation of glyceraldehyde 3-phosphate to 1,3-bisphosphoglycerate (reaction 6 of glycolysis). This regeneration of NAD + allows glycolysis to be maintained in the absence of oxygen.

In the aerobic mode, NAD + is regenerated by the respiratory chain.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.