AP Biology Prokaryote Gene Regulation

What type of operon is the trp (tryptophan) operon?

• inducible
• repressible
• positive control
• promoible

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

• prokaryotes

• eukaryotes

• animals only

• viruses

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

• promoter

• enhancer

• operator

• gene

An operon consists of all the the following EXCEPT

• operator
• promoter
• regulatory gene
• genes of the operon

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

• inducer

• repressor

• activator

• corepressor

A small molecule that binds to a repressor and makes it active

• repressor
• regulator
• activator
• corepressor

A small molecule that binds to the repressor and makes it inactive is

• corepressor
• inducer
• promoter
• operator

The repressor is the protein product of a(n)

• operator

• regulatory gene

• lac gene

• corepressor

The tryptophan operon is

• permanently turned on.

• turned on when tryptophan is present in the growth medium.

• turned off only when glucose is present in the growth medium.

• turned off when tryptophan is added to the growth medium.

In the lac operon model, the genes within the operon will be expressed if

• lactose is absent in the cell

• glucose is present in the cell

• lactose is present in the cell

• tryptophan is present