Gene Regulation in Prokaryotes

the trp operon encodes...

• 5 genes

• 3 genes

the lac operon encodes...

• 5 genes

• 3 genes

trp is a..

• repressible operon

• inducible operon

The lac operon is a...

• repressor operon

• inducible operon

When tryptophan is high in the cell

• the operon is turned off

• the operon is turned on

when the tryptophan is high in the cell the repressor proteins changes shape and binds to the operator... this means it is...

• active

• inactive

Tags

NGSS.HS-LS1-3

when tryptophan is high in the cell...

• RNA polymerase cannot bind, so no transcription

• RNA polymerase can bind, so transcription happens

When tryptophan is low in the cell

• the operon is on

• the operon is off

When tryptophan is low in the cell, the repressor protein does not change shape. This means...

• It is inactive, transcription happens

• It is active, transcription does not happen

When lactose is low in the cell

• the operon is off

• the operon is on

Tags

NGSS.HS-LS1-3