lac operon Flashcards
1
Q
the lac operon switch is “off when lactose is…
A
not present
2
Q
the lac operon switch is “on” when lactose is…
A
present
3
Q
what happens when there is no lactose?
A
1) the lac repressor protein binds to the operator
2) prevents RNA polymerase from binding
3) no transcription
4
Q
what happens when there is lactose?
A
1) lactose binds to the receptor protein which changes shape
2) RNA polymerase can bind to the promoter
3) structural genes are transcribed
