Lecture CH 6.4 lac Operon

All of the following are components of the lac operon except

• regulatory gene

• Promoter

• operator

• structural gene

A protein that binds to the operator and blocks the RNA polymerase

• regulator
• repressor
• activator
• corepressor

________________ is the binding site for RNA polymerase.

Structural genes consist of

• lacI

• lacZ

• lacY

• lacA

lacA encodes for ________________________

Enzyme that facilitates the transport of lactose into E.coli

• Transacetylase

• Permease

• B-galactosidase

• Polymerase

What happen to lac operon if repressor protein is in inactive form

• lac operon activated

• lac operon inactivated

In the lac operon the inducer is

• allolactose

• glucose

• galactose

• all of the above

Function of lac operon is