Gene Expression

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4 Terms

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Role of mRNA in gene expression

Active mRNA is translated into proteins which control processes in the cell and forms part of the cell structure

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Why do cells specialise/differentiate?

  • only some genes are switched on

  • Switched on genes produce active mRNA which is then translated into proteins

  • The protein produced determines the cell structure

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What is the Lac Operon?

Lactose stops the repressor molecule from preventing RNA polymerase binding to the operator gene region of DNA. This switches the gene on so the cell doesn’t waste resources making enzymes.

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