BIO 340 ASU General Genetics Taylor Gile Exam 3
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gene regulation that is always on/ex-
constitutive pressed (level depends on promoter
strength)
Regulated Expression Expressed under certain conditions
expressed under certain conditions.
regulated expression
Negative and positive regulation
Preventing or reducing transcription by
Negative Regulation
binding a repressor protein
Increases transcription by binding an ac-
positive regulation
tivator protein
Components of Negative Regulation Operator, Repressor
____________ prevents the repressor
Inducer
from binding to the operator.
transcription is prevented when a
Repressor _______________ protein binds to the
operator (downstream of the promoter)
the REPRESSOR might need a
COREPRESSOR
___________ to prevent transcription
REPRESSOR might be prevented from
doing its job by an _______________
Inducer
(which lifts negative regulation and there-
by induces transcription)
___________ is required for the activator
Effector
to bind to the promoter.
__________ prevent the activator from
Inhibitors
binding to the promoter.
an __________ is a group of genes that
Operon share the same promoter and are tran-
scribed together (in prokaryotes)
_________ allows lactose to enter the
Permease
cell.
Regarding the Lac operon, for what do
²-galactosidase
the following genes code? • Z gene
1/3
Study online at https://quizlet.com/_8ca3gh
gene regulation that is always on/ex-
constitutive pressed (level depends on promoter
strength)
Regulated Expression Expressed under certain conditions
expressed under certain conditions.
regulated expression
Negative and positive regulation
Preventing or reducing transcription by
Negative Regulation
binding a repressor protein
Increases transcription by binding an ac-
positive regulation
tivator protein
Components of Negative Regulation Operator, Repressor
____________ prevents the repressor
Inducer
from binding to the operator.
transcription is prevented when a
Repressor _______________ protein binds to the
operator (downstream of the promoter)
the REPRESSOR might need a
COREPRESSOR
___________ to prevent transcription
REPRESSOR might be prevented from
doing its job by an _______________
Inducer
(which lifts negative regulation and there-
by induces transcription)
___________ is required for the activator
Effector
to bind to the promoter.
__________ prevent the activator from
Inhibitors
binding to the promoter.
an __________ is a group of genes that
Operon share the same promoter and are tran-
scribed together (in prokaryotes)
_________ allows lactose to enter the
Permease
cell.
Regarding the Lac operon, for what do
²-galactosidase
the following genes code? • Z gene
1/3
