Choline and Methionine Are Both Sources of Methyl Groups for Transmethylation

question 62

Multiple Choice

Choline and methionine are both sources of methyl groups for transmethylation but

• A) only methionine needs to be activated.
• B) the activation of methionine is via oxidation while that of choline is not.
• C) the product of activation of choline transfers its methyl group only to homocysteine while activated methionine has many acceptors.
• D) in their appropriate forms, all three methyls of choline can be transferred to a methyl acceptor while methionine can transfer only one.
• E) the activation of choline requires tetrahydrofolate while that of methionine requires ATP.

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