Most of the Carbon in Amino Acid Biosynthesis Comes From

Question

Most of the carbon in amino acid biosynthesis comes from
A) citric acid cycle intermediates.
B) citric acid cycle intermediates and glycolysis products.
C) glycolysis products.
D) glycolysis intermediates and products.

Accepted Answer

The carbon in amino acid biosynthesis comes mostly from citric acid cycle intermediates and glycolysis products. These pathways provide the necessary carbon skeletons to form the different amino acids. Glycolysis intermediates alone would not be enough to provide all the carbon necessary for amino acid biosynthesis.