Gene Expression and Regulation

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

• regulator

• repressor

• activator

• corepressor

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

Regulatory proteins (transcription factors) may

• encourage transcription

• prevent transcription

• stop transcription once its started

• either encourage or prevent transcription

In a repressible operon, the corepressor

• allows transcription to progress

• allow the repressor to prevent transcription

• binds to the promoter and transcribes the gene

What is 1 in the diagram?

• RNA polymerase

• Inducer

• Repressor

• Operator

What is 2 in the diagram?

• RNA polymerase

• Inducer

• Repressor

• Operator

In the top picture the operon is

• on

• off

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

• inducible

• repressible

• positive control

• promotor

What is 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

An operon consists of all the the following EXCEPT

• operator

• promoter

• regulatory gene

• genes of the operon