Essential Biochemistry - Vitamins (Section 5 - No. 19)
Both folic acid and methylcobalamin are required for:
Phosphorylation
Deamination
Methylation of homocysteine to methionine
Conversion of pyruvate to acetyl CoA
Explication
Both folic acid and methylcobalamin are involved in the methylation of homocysteine to methionine.