Active moiety of CoA is: (A) Acetyl group, (B) Pantothenic acid, (C) Thiol of beta alanine, (D) Thiol of pantothenic acid
Answer is D. - Synthesis of coenzyme A from pantothenate occurs in a series of  reactions. Pantothenate is  first phosphorylated to  which  cysteine is  added. Decarboxylation, followed by addition of AMP moiety and a phosphate (each from ATP) results in  coenzyme A.
-Coenzyme A serves as a carrier of activated acetyl or acyl groups (as thiol esters).