Chapter all: Control of Gene Expression

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1 Dec 2016
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BIO120H1 Full Course Notes
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Control of gene expression: many processes are common to all cells, so their genes are present in all the cells of the body. Transcriptional control: to control when and how often a given gene is transcribed. Rna processing control: to control the splicing and processing of rna transcripts. Rna transport and localization control: to select which completed mrnas are exported from the nucleus to the cytosol and determining where in the cytosol they are localized. Translational control: to selecting which mrnas in the cytoplasm are translated by ribosomes. Mrna degradation control: to selectively destabilize certain mrna molecules in the cytoplasm, Transcription regulators switch genes on and off: the genome of the bacterium e. coli consists of a single, circular dna molecule of about. 4. 6 106 nucleotide pairs: bacterial dna encodes approximately 4300 proteins, the genes for tryptophan are arranged in a cluster on the chromosome and are transcribed.

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