Gene Expression Regulation Flashcards
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
