JK L1 bacterial gene expression Flashcards Preview

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Flashcards in JK L1 bacterial gene expression Deck (6)
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are genes expressed all the time? and why?

no because it would be a waste


what is controlling the start and production of RNA Polymerase?

Sigma factor provides the specificity as to where RNA POL binds


how can you control the level of gene expression through sigma's...?

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


what's the classic way of controlling gene expression?

transcriptional regulators


transcriptional factor genes means what...?

control gene expression of other genes

produce proteins that control transcription of other genes


activators do...?

repressors do...?

activators- turn on gene expression

repressors- turn of gene expression