What Product of the First Step of Methionine Degradation Is

Question

What product of the first step of methionine degradation is an important methyl group donor?
A) 5-methyltetrahydrofolate
B) methylcobalamin
C) S-adenosylmethionine
D) S-adenosylhomocysteine
E) None of the answers is correct.

Accepted Answer

S-adenosylmethionine (SAM) is the product of the first step of methionine degradation and is a crucial methyl group donor in numerous biochemical reactions.