Before ARF transcription factors can trigger auxin-induced gene expression, what must happen?
A. Auxin binds to TIR1, an auxin receptor.
B. Auxin binds to ubiquitin, a degradation tag.
C. Ubiquitin must destroy TIR1 to release Aux/IAA proteins.
D. Auxin must bind to the ARF transcription factor.
E. Auxin degrades Aux/IAA proteins which repress ARF transcription factors.
Answer: A
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