In plant cells, auxin binds to a
a. cell surface receptor and triggers the ras/raf pathway.
b. nuclear receptor that changes its shape so that it can bind to and activate genes.
c. receptor ubiquitin ligase that stimulates the degradation of transcriptional repressors, resulting in activation of genes.
d. cell surface molecule that stimulates fluid uptake.
Ans: c. receptor ubiquitin ligase that stimulates the degradation of transcriptional repressors, resulting in activation of genes.
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