Chapter 7.4: Control of Gene Expression in Prokaryotes

The ______ model is used to explain how repressors and inducers affect operons.

Jacob-Monod

Operons contain structural genes, an operator site, a promoter site, and a regulator gene. Which structure provides a place for RNA polymerase to bind?

a promoter site

In repressible systems, the repressor made by the regulator gene is inactive until it binds to a _______.

corepressor

To transcribe inducible systems, the repressor binds to an ______ so that RNA polymerase can move down the gene.

inducer

The lac operon is a(n) (inducible, repressive) system.

inducible

Inducible or repressible systems: which ones are bonded to repressors under normal conditions?

inducible systems

In (negative, positive) control mechanisms, binding a protein to DNA stops transcription.

negative

In inducible systems, the repressor is bound to the _______ site, preventing RNA polymerase from transcribing the gene.

operator

In repressible systems, the repressor binds to a corepressor and the complex that is formed binds to the ______ to prevent RNA polymerase from further transcribing the genes.

operator site

Operons contain structural genes, an operator site, a promoter site, and a regulator gene. Which structure is a nontranscribable region of DNA that is capable of binding a repressor protein?

operator site

In prokaryotes, a(n) _____ is a cluster of genes transcribed as a single mRNA.

operon

In (negative, positive) control mechanisms, binding a protein to DNA increases transcription.

positive

Operons contain structural genes, an operator site, a promoter site, and a regulator gene. Which structure codes for repressor proteins?

regulator genes

The trp operon is an example of a(n) (inducible, repressible) system.

repressible

Inducible or repressible systems: which ones are actively transcribing under normal conditions?

repressible systems

Operons contain structural genes, an operator site, a promoter site, and a regulator gene. Which structure codes for the protein of interest?

structural gene