Question

Coenzyme A is a co-factor of vitamin

• A. riboflavin
• B. pantothenic acid
• C. folic acid
• D. pyridoxine

Hint:

Remember: Coenzyme A is derived from Vitamin \(B_5\) (pantothenic acid), while FAD and FMN are derived from Vitamin \(B_2\) (riboflavin).

Answer 1

The Correct Option is B

Step 1: Understand Coenzyme A (CoA).
Coenzyme A is an important coenzyme involved in several metabolic pathways, especially in the transfer of acyl groups during carbohydrate, lipid, and amino acid metabolism.

Step 2: Identify the vitamin component of CoA.
Coenzyme A contains pantothenic acid as one of its essential structural components. Pantothenic acid is also known as Vitamin \(B_5\).

Step 3: Analyze option (A).
Riboflavin corresponds to Vitamin \(B_2\) and forms coenzymes such as FAD and FMN, not Coenzyme A. Hence, this option is incorrect.

Step 4: Analyze option (B).
Pantothenic acid is the precursor of Coenzyme A and is directly involved in its synthesis. Therefore, this option is correct.

Step 5: Analyze option (C).
Folic acid functions mainly in one-carbon transfer reactions and forms tetrahydrofolate derivatives. It is not related to Coenzyme A formation. Thus, this option is incorrect.

Step 6: Analyze option (D).
Pyridoxine corresponds to Vitamin \(B_6\), which forms pyridoxal phosphate involved in amino acid metabolism. It is not a component of Coenzyme A. Therefore, this option is incorrect.

Step 7: Final conclusion.
Hence, Coenzyme A is a co-factor derived from pantothenic acid.
\[ \boxed{\text{pantothenic acid}} \]
Therefore, the correct answer is option (B).