Operons
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17 Terms
define operon
a group of genes that operate together
what do operons do?
regulate gene expression in prokaryotes
structural genes
genes that code for proteins
regulatory gene
codes for repressor protein
trp operon
repressible operon
lac operon
group of genes involved in lactose metabolism
inducer
A specific small molecule that inactivates the repressor in an operon.
What is a co-repressor?
A molecule that binds to the repressor.
What does a co-repressor do to the repressor?
It causes the repressor to be active.
What is the effect of an active repressor on transcription?
It inhibits transcription.
What does an active repressor bind to?
The operator.
When arabinose is present in the environment…
repressor is inactive
RNA polymerase can access promoter
the genes are expressed
when arabinose is absent in the environment…
repressor is active
RNA cannot access the promoter
genes will not be transcribed
Note 
Flashcards (50)