Practice question
Question
Ethylene biosynthesis begins from which amino acid?
Explanation
Go with B — Methionine. Under Ethylene, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Cysteine; C) Tryptophan; D) Phenylalanine. When two options sound similar, choose the one that matches the textbook definition most tightly.
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