A major role of vitamin B-12 in cellular metabolism is
A) transfer of a methyl group to the amino acid homocysteine,forming the amino acid methionine.
B) transfer of a methyl group to the pyrimidine uracil,forming the pyrimidine thymine.
C) in transamination reactions,allowing the synthesis of nonessential amino acids.
D) as an electron acceptor,allowing function of the electron transport chain.
Correct Answer:
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Q63: The amino acids _ and _ are
Q64: Intrinsic factor is produced by the
A)beta-cells of
Q65: The RDA for vitamin C is increased
Q66: Vitamin B-12 is supplied mostly in
A)fruits and
Q67: Vitamin B-12 is absorbed in the
A)stomach.
B)duodenum.
C)jejunum.
D)ileum.
Q69: Which group of foods provides substantial amounts
Q70: The B-vitamin that has significant liver stores
Q71: The first symptom of scurvy is
A)iron-deficiency anemia.
B)sudden
Q72: Megaloblastic anemia develops as a result of
Q73: Which of the following factors can interfere
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