Question

Pyruvate can be a substrate or product involved in each of the following except

A) fermentation.
B) aerobic glycolysis.
C) gluconeogenesis.
D) amino acid biosynthesis.
E) Pyruvate can be involved in all of the above.

Answer 1

Pyruvate can be involved in all of the above processes: fermentation, aerobic glycolysis, gluconeogenesis, and amino acid biosynthesis.

Step-by-step explanation:

Pyruvate can be involved in all of the above processes: fermentation, aerobic glycolysis, gluconeogenesis, and amino acid biosynthesis. In fermentation, pyruvate is reduced to either lactate or ethanol to regenerate NAD+, allowing glycolysis to continue in the absence of oxygen. In aerobic glycolysis, pyruvate is transported into the mitochondria and is converted to acetyl CoA, which enters the citric acid cycle to generate energy. In gluconeogenesis, pyruvate is converted back into glucose to maintain blood glucose levels. Finally, pyruvate can also be used as a precursor for amino acid biosynthesis.