Which of the following vitamins is essential for the conversion of homocysteine to methionine in the methionine cycle?

A Vitamin B12 ✓
B Vitamin B6
C Folic acid
D Vitamin B2

Explanation

Vitamin B12 is essential for the conversion of homocysteine to methionine in the methionine cycle, and its deficiency can lead to hyperhomocysteinemia.

Mnemonic

'B12' = 'be twelve' steps ahead in methionine cycle

Source

Biochemistry by Lippincott
Metabolic and Nutritional Disorders Biochemistry One-carbon metabolism Hard MEDICAL Confidence: high