Activator proteins in prokaryotes experience shape changes in the presence or absence of small molecules. As a consequence: (select all correct choices)
a) The activator protein may bind to the DNA and enhance transcription.
b) The activator protein may undergo conformational changes that prevent binding to the DNA.
c) The activator protein may interact with co-repressors in the absence of small molecules.
d) The activator protein may be degraded in the presence of small molecules.
