Regulatory Mechanisms (OCR A-Level Biology A): Flashcards
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Practise the cards
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Three levels of gene expression control
Three levels of gene expression control
Transcriptional, post-transcriptional, post-translational
Location of promoter region
Location of promoter region
~100 base pairs upstream from gene start site
Role of transcription factors
Role of transcription factors
Bind to promoter region to initiate transcription
Oestrogen receptor (ERα) function
Oestrogen receptor (ERα) function
Acts as transcription factor, can initiate up to 100 genes
Definition of operon
Definition of operon
DNA unit with multiple genes controlled by one promoter
Lac operon regulates
Lac operon regulates
Enzymes for lactose metabolism in E. coli
Role of lactose in lac operon
Role of lactose in lac operon
Acts as inducer, binds repressor, prevents operator binding
Introns vs exons
Introns vs exons
Introns: non-coding; Exons: coding sequences
Function of snRNPs
Function of snRNPs
Remove introns from pre-mRNA, join exons to make mature mRNA
Role of cyclic AMP (cAMP)
Role of cyclic AMP (cAMP)
Second messenger that regulates many cellular processes