Which of the following enzymes is involved in the conversion of homocysteine to methionine in the methionine cycle?

A Methionine synthase ✓
B Homocysteine methyltransferase
C Cystathionine beta-synthase
D Betaine-homocysteine methyltransferase

Explanation

Methionine synthase is an enzyme that catalyzes the conversion of homocysteine to methionine in the methionine cycle, using vitamin B12 as a cofactor.

Source

Harper's Illustrated Biochemistry
Metabolic and Nutritional Disorders Biochemistry Amino Acid Metabolism Hard MEDICAL Confidence: medium