EN si dnetecrov ot IPE aiv MP,TN iwhch is iuecdnd yb rcisl.oot
In case anyone else was wondering about the other choices:
A: Acetyl-CoA carboxylase is the first committed step in fatty acid synthesis
B: Homocysteine methyltransferase turns homocysteine into methionine (we can deduce this from knowledge about homocystinuria)
C: Methionine adenosyltransferase makes SAM. SAM has two roles that we know of - one in turning methionine back into homocysteine, and one turning norepinephrine into epinephrine. This could make it a tempting choice but at the time I just saw the word 'methionine' and thought that couldn't have anything to do with cortisol/catecholamines.
D: LOL for methylmalonyl-CoA racemase, wiki says "It is routinely and incorrectly labeled as 'methylmalonyl-CoA racemase'. It is not a racemase because the CoA moiety has 5 other stereocenters." Good job NBME. Anyway, methylmalonyl-CoA epimerase is involved in the same catabolic pathway that we know of through propionic acidemia, so it's involved in breakdown of fatty acids and amino acids.