Practice question
Question
Copper ion is required for proper functioning of:
Explanation
The right choice is C: Ethylene receptor. In Ethylene, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) ACC synthase; B) ACC oxidase; D) CTR1. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.
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