Which enzyme is responsible for 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 catalyzes the conversion of homocysteine to methionine using 5-methyltetrahydrofolate as a methyl donor.

Source

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