Inducible Operon

The lac operon is…

• Inducible operon so starts off and is activated by lactose

• Inducible operon so starts on and is deactivated by lactose

• Repressible operon so starts off and is activated by lactose

• Repressible operon so starts on and is deactivated by lactose

Where does the repressor in an operon bind?

• Operator

• Promoter

• Regulatory sequence

• TATA box

If the repressor is bound to the operator…

• RNA polymerase is able to bind, the operon is off

• RNA polymerase is able to bind, the operon is on

• RNA polymerase is unable to bind, the operon is off

• RNA polymerase is unable to bind, the operon is on

What types of cells have operons? 

• Eukaryotes

• Prokaryotes

• Neither eukaryotes nor prokaryotes

• Both eukaryotes and prokaryotes

What does the repressor protein do?

• Allows RNA polymerase to read the gene

• Prevents RNA polymerase from reading the gene

• Reads the gene

• Translates the gene

What type of operon is the lac (lactose) operon?

• inducible

• repressible

• positive control

• promoible

The "on/off" switch for an operon is called the _________.

• promoter

• repressor

• operator

• gene

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

• regulator

• repressor

• activator

• corepressor

Operons are found in the cells of which of the following types of organisms?

• prokaryotes (bacteria)

• eukaryotes (plant and animals)

• animals only

• viruses

What is an operon?

• a part of the promoter region of a gene

• a part of RNA polymerase

• a unit made up of linked genes that code for proteins needed to do a specific task

• A protein needed for DNA replication