Discussion
Coenzyme A is a co-factor of vitamin
Answer: B
Coenzyme A is derived from pantothenic acid (vitamin B5).
Coenzyme A is built from pantothenic acid, cysteamine (from cysteine) and a 3'-phosphorylated ADP. Its terminal thiol forms thioesters such as acetyl-CoA, which carry acyl groups in the citric acid cycle and in fatty acid synthesis and oxidation.
The other vitamins make different coenzymes: riboflavin (B2) gives FAD and FMN, folic acid gives tetrahydrofolate for one-carbon transfers, and pyridoxine (B6) gives pyridoxal phosphate for amino acid metabolism.
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