Chapter 15

gene expression in bacterial controlled at what level?

• epigentic

• transcription

• RNA processing

• translation

a segment of DNA which acts as the "switch", is positioned with the promoter

• operon

• operator

• repressor

• regulatory gene

protein that switches off operon

• operon

• operator

• repressor

• regulatory gene

what does the repressor do

• switches off operator by binding to it

• makes introns (genes inactive)

• binds to operator and blocks attachment of RNA polymerase

• takes out the introns

produces the protein repressor (not part of the operon)

• operon

• operator

• repressor

• regulatory gene

genetic regulatory system found in bacteria and their viruses in which genes code for functionally related proteins and clustered around the DNA (controlled by on-off switch)

• operon

• operator

• repressor

• regulatory gene

what is included in the operon?

• entire stretch of DNA

• operator

• promoter

• genes they control

Which of the following statements provide accurate information?

• inactive repressor = inactive operon

• active repressor = inactive operon

• inactive repressor = active operon

• active repressor = active operon

A lack of this nonprotein molecule would result in the inability of the cell to "turn off" genes

• regulatory gene

• repressor

• corepressor

• operon

corepressor

• restricts transcription

• restricts translation

• binds to repressor and activates it

• binds to operator sites