How are genes switched off? (3)
Different sigma factors, regulatory proteins and attenuating transcription
How are sigma factors named?
After their molecular weight
how are structural genes transcribed?
through a single promoter yielding a polygenic message
What is the difference between a positive and negative regulator?
Positive regulators enhance gene expression whereas negative regulators suppress expression
What is induction?
Where a gene is expressed in the presence of an inducer molecule
What is repression?
Where a gene is switched off in the presence of a repressor molecule
If a regulator is present and expression occurs is that positive or negative regulation?
Positive
What is a sigma factor?
A regulatory protein that can express many genes, but only with the right promoter region.
Where do regulatory proteins bind?
Regulatory regions
What is a CAP?
Catabolite regulatory protein
