Differential gene expression Flashcards
1
Q
What happens when lactose is NOT present?
A
• the regulatory gene expression produces the lac repression, which is a transcription favtor that binds to the operator site when there is not lactose present.
2
Q
Define Operon.
A
Genes with related functions grouped together.
3
Q
What is ‘Z and Y’?
A
genes coding for proteins involved in the metabolism of lactose - stuctural genes
4
Q
What is the Repressor Protein?
A
Made by the regulatory gene, can bind to O to switch gene off.
5
Q
What is ‘O - operator’ ?
A
DNA binding site of a repressor protein - can block promoter.
6
Q
What is ‘P - promoter’ ?
A
RNA polymerase bunding site - starting point for transcription if genes
7
Q
Describe structural genes.
A
genes that code for useful proteins
