The Route by Which Methionine is Degraded Provides for the Synthesis

Question

The route by which methionine is degraded provides for the synthesis of which amino acid?
A)serine
B)threonine
C)valine
D)isoleucine
E)cysteine

Accepted Answer

The degradation of methionine leads to the synthesis of cysteine. Methionine is first converted into homocysteine, which then combines with serine to form cystathionine. Cystathionine is subsequently broken down into cysteine, among other products.