What is not true about the lac operon in E. coli?
a.Codes for b-galactosidase that breaks down lactose with glucose as an end product
b.Transcription by RNA polymerase is promoted by LacI binding to the promoter
c.Expression is repressed by the LacI protein
d.Expression of the operon is turned on in the presence of lactose
e.The LacI repressor binds to a region upstream of the start codon called an operator