Gene regulation

When will a lac operon be activated?

• Glucose is low and lactose is present

• Glucose is high and lactose is absent

• both glucose and lactose is high

• both glucose and lactose is low

DNA is coiled around

• chromatin

• histones

• nucleosome

• nucleus

Bacterial genes are organized into

• promotors

• operons

• regulator genes

• structural genes

Where does the RNA Polymerase bind to for the initiation of

• Regulator

• Structural genes

• Operator

• Promotor

In prokaryotes, gene expression is regulated at various different levels

• true

• false

specific sequence within the DNA that bind transcription factors to turn transcription on or off

• Regulator

• Promotor

• Operator

• Structural genes

When tryptophan (try) is absent, the trp represser unbinds from the operator and this results in RNA synthesis to do what?

• be blocked

• proceed

Inducible operon s

• lac operon

• trp open

• bound to a repressor under normal conditions

• similar to competitive inhibition

RNA polymerase needs --- to initiate transcription.

• holoenzymes

• transcriptional factors

• histones

• microRNA

T/F In prokaryotes, gene expression is regulated at various different levels

• T

• F