試題詳解

33. Which of the following statements about the reactions involved in the biosynthesis of amino acids is       false      ?
(A) Animals can produce tyrosine directly from phenylalanine through hydroxylation.
(B) Asparagine is not an essential amino acid in human. It is synthesized by amidation of aspartate, with glutamine donating the .
(C) Chorismate is the parent compound for the synthesis of amino acids with aromatic ring.
(D) Tyrosine can give rise to a family of neurotransmitter that includes dopamine and norepinephrine.
(E) Glutamate can give rise to γ-aminobutyrate (GABA). It is a decarboxylation reaction requiring biotin.