試題詳解

43. Which of the following statements in the enzyme cofactors involved in one-carbon transfer reactions is false?
(A) Tetrahydrofolate, S-adenosylmethionine, and biotin are important cofactors involved in the reactions of one-carbon transfers.
(B) S-Adenosylmethionine is synthesized from ATP and methionine.
(C) In the activated-methyI cycle for the synthesis of methionine and S-adenosylmethionine, homocysteine is converted to methionine through the donation of the methy! group frommethylenetetrahydrofolate.
(D) Acetyl-CoA carboxylase, which catalyzes the formation of malonyl-CoA from acetyl-CoA, contains a biotin prosthetic group.
(E) The methyl group donated from S-adenosylmethionine is more reactive than that donated from N⁵-methyltetrahydrofolate.