Gene Regulation and Mutation

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

• prokaryotes

• eukaryotes

• animals only

• viruses

Tags

NGSS.HS-LS1-1

What is the name of the stretch of DNA where RNA polymerase binds?

• operator

• promoter

• enhancer

• regulatory gene

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

• promoter

• enhancer

• operator

• gene

What is a gene?

• A segment of RNA that encodes for a protein

• The portion of the chromosome that does not get transcribed

• A segment of DNA that encodes for a protein

• The collection of your chromosomes

Tags

NGSS.HS-LS1-1

An operon consists of all the the following EXCEPT

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

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

The purpose of the lac operon is to produce enzymes that

• synthesize lactose

• use lactose

• synthesize tryptophan

• use tryptophan