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