Lac Operon Flashcards
1
Q
Operon
A
A Dna segment with operator, promotor, structual genes
2
Q
operator
A
a segment of DNA to which a transcription factor binds to regulate gene expression by repressing it.
3
Q
repressors
A
Repressors bind to operators to prevent transcription.
4
Q
lac operon
A
Operon that is required for metabolism of lactose.
5
Q
Structual genes in lac operon
A
- b-galactosidase
- thiogalactoside transacetylase
- permase
6
Q
When glucose is present
A
Repressor at operator region and no transcription
7
Q
Lactose present
A
lactose binds to repressor and repsessor leaves operator region
8
Q
cAMP effect
A
inversely prop to glucose
binds to CAP–>CAmp CAP complex
9
Q
cAMP+CAP complex effect
A
binds to CAP on lac operon and initiates transcription
