Where does the lac repressor bind when lactose is absent?
AThe lac operator
BThe ribosome
CThe CAP site only
DThe terminator
Answer & Solution
Correct answer: A. The lac operator
The repressor binds the operator near the start of lacZ and blocks RNA polymerase.
Related questions
Besides allolactose, which artificial inducer binds the lac repressor?At which level does the lac operon control gene expression?The lac repressor is an allosteric protein. What does this mean?Which was the first genetic regulatory mechanism to be understood clearly?The lac repressor is made of how many identical subunits?Sequential use of glucose then lactose in two growth phases is called what?How does the cAMP level relate to glucose availability?Lac genes are co-transcribed into which kind of mRNA?