AP Bio: Operons

Which of the following best describes an operon?

• a part of a ribsome

• a part of a RNA

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

• needed for DNA replication

Which of the following types of organisms contain operons?

• prokaryotes (bacteria)

• eukaryotes (plant and animals)

• animals only

• viruses

What is the role of operons in prokaryote gene expression?

• It makes the genes prokaryotes be turned on
• It accounts for the regulation of gene activity in response to the needs of the cells
• To make DNA for the gene
• To make the gene turn of and off

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

• regulator
• repressor
• activator
• corepressor

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

• promoter
• repressor
• operator
• gene

Identify #1 in the operon diagram.

• RNA polymerase

• Inducer

• Repressor

• Operator

Identify #2 in the operon diagram.

• RNA polymerase

• Inducer

• Repressor protein

• Operator

Identify #4 in the operon diagram.

• RNA polymerase

• Inducer

• Repressor

• Operator

Identify #5 in the operon diagram.

• RNA polymerase

• Inducer

• Repressor

• Operator

Look at the operon on the top. Is this operon ON or OFF?

• on

• off