Practice question
Question
A structural requirement for GA bioactivity is presence of:
Explanation
Go with B — Carboxyl group at C-7. Under Gibberellins, 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) Hydroxyl at C-13; C) Methyl at C-20; D) Double bond at C-2. When two options sound similar, choose the one that matches the textbook definition most tightly.
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