Essential Biochemistry - Vitamins (Section 1 - No. 10)
Both folic acid and methylcobalamin are required in:
Phosphorylation
Deamination
Methylation of homocysteine to methionine
Conversion of pyruvate to acetyl CoA
Explication
Folic acid and methylcobalamin are required in the methylation of homocysteine to methionine.