molecular genetics 3/17-3/19

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Description and Tags

Biology

Genetics

AP Biology

Unit 6: Gene Expression and Regulation

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11 Terms

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why gene expression is necessary

  • control the production of proteins

  • cell differentiation

  • development

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simplified model

operon

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trp (tryptophan)

repressible

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lac (lactase)

inducer

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DNA level

turn the gene on or off

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pre mRNA level

processing or not processing the pre mRNA

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mRNA level

interception (block or degrade)

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polypeptide level

degrade

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discal control element

enhancer

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sequence of turning a gene on

  1. activator binds to enhancer

  2. DNA bends

  3. activator binds to TATA box

  4. RNA polymerase binds to promoter

  5. transcription begins

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intercepting mRNA

special mRNA (miRNA, siRNA)