Practice question
Question
CTR1 is a:
Explanation
The right choice is B: MAPKKK. 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) Receptor; C) Transcription factor; D) Ion channel. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.