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

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

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

• repressor
• regulator
• activator
• corepressor

The lac operon is referred to as a(n) __________ operon.

• inducible

• repressible

• audible

• inaudible

In eukaryotes, proteins that help the RNA polymerase bind to the regulatory region for transcription are called ____________.

• transcription factors
• topoisomerase
• regulatory genes
• activators

Tags

NGSS.HS-LS1-1

One way to regulate the expression of a gene is to control the formation of mRNA. This is called ___ control.

• transcriptional

• translational

• post-transcriptional

• post-translational