試題詳解

4. Which statement is INCORRECT about these amino acids, and amino acid derivatives?
(A) GABA (y-aminobutyric acid) is a potent inhibitory neurotransmitter derived from glutamic acid.
(B) Omnithine is an important metabolic intermediate.
(C) Epinephrine is a hormone derived from tryptophan.
(D) Serotonin is a neurotransmitter derived from tryptophan.
(E) Histamine is a neurotransmitter derived from histidine.