69. Many biomolecules are derived from amino acid precursors. Serotonin and dopamine are synthesized from ____and____ , respectively.
(A) histidine; tyrosine
(B) phenylalanine; tryptophan
(C) tryptophan; tyrosine
(D) histidine; tryptophan
(E) tryptophan; histidine
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題目解析 這道題目考察的是生物分子,特...