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In plants, Auxins such as IAA induce changes in gene expression by a. Triggering an increase...

In plants, Auxins such as IAA induce changes in gene expression by

a. Triggering an increase in cAMP levels

b. Cooperating to mark repressor proteins for destruction

c. Binding to promoters

d. Triggering calcium release

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Answer #1

Ans: Cooperating to mark repressor proteins for destruction

Auxin response factors ( ARFs) initiate the Auxin signal and enhance the gene transcription. In the absence of Auxin, Aux/IAA repressors bind to ARFs and suppress the transcriptional activity of ARFs. In the presence of Auxin, Auxin acts as a molecular glue between Auxin receptor (TIR1) and Aux / IAAs repressors, and leads to repressors degradation. ARFs are free to bind to DNA and enhance the transcription.

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