Lac Operon

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

• prokaryotes

• eukaryotes

• animals only

• viruses

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

A key advantage of grouping genes with related functions is that a single "on-off" switch can control the whole cluster.

• True

• False

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 protein that binds to the operator and blocks the RNA polymerase

• inducer

• repressor

• activator

• corepressor

The repressor is the protein product of a(n)

• operator

• regulatory gene

• lac gene

• corepressor

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 binding of repressors to operators are not reversible.

• True

• False