JK L1 bacterial gene expression

Question 1

are genes expressed all the time? and why?

Answer 1

no because it would be a waste

Question 2

what is controlling the start and production of RNA Polymerase?

Answer 2

Sigma factor provides the specificity as to where RNA POL binds

Question 3

how can you control the level of gene expression through sigma’s…?

Answer 3

there are diff sigma’s that will bind RNA pol to diff promoters, meaning RNA pol has specificity to diff promoters

there for if you can control which sigma is being produced then you can control diff groups of promoters by expressing a particular sigma at a particular time

Question 4

what’s the classic way of controlling gene expression?

Answer 4

transcriptional regulators

Question 5

transcriptional factor genes means what…?

Answer 5

control gene expression of other genes

produce proteins that control transcription of other genes

Question 6

activators do…?

repressors do…?

Answer 6

activators- turn on gene expression

repressors- turn of gene expression