Biochemical role of vitamin B12-

1) Vitamin B12 along with folic acid is essential for the development of red blood cells beyond megaloblast stage.
2) It acts a coenzyme in the conversion of methyl malonyl CoA to succinyl CoA.
3) It is required in the conversion of ribonucleotides to deoxyribonucletides.
4) Its coenzyme acts in transfer of methyl group.