A 42 year old writer had a history of gastrectomy for adenocarcinoma stomach 3 years ago. He complaints of being noticed to be pale by his family. The blood picture shows MCV 105 and Hb 7 g%. The reaction that cannot properly operate is
A. Methionine synthesis from homocysteine
B. Amino levulinic acid synthesis from glycine
C. Adenine synthesis from glycine
D. Isomerization of methyl malonyl CoA to Succinyl CoA
E. Heme synthesis from protoporphyrin
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