A deficiency of vitamin B12 in humans results in anemia primarily because it is which of the following?
A) a cofactor in the biosynthesis of purine nucleotides required for the synthesis of DNA
B) involved in the conversion of N5-methyl-THF to THF
C) necessary for the absorption of folic acid from the gut
D) required for the conversion of cystathionine to cysteine
E) utilized as a cofactor in synthesis of thymidine nucleotides
Correct Answer:
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