How does the addition of coenzyme A, a sulfur-containing molecule derived from a B vitamin, function in the subsequent reaction?
A) It drives the reaction that regenerates NAD+.
B) It utilizes this portion of a B vitamin, which would otherwise be a waste product from another pathway.
C) It provides the sulfur needed for the molecule to enter the mitochondrion.
D) It provides a relatively unstable molecule whose acetyl portion can be readily transferred to a compound in the citric acid cycle.
E) It removes one molecule of CO2
Answer: D