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6 Cards in this Set
- Front
- Back
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Explain negative vs. positive control of expression.
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Negative control: genetic expression occurs unless it is shut off by some form of a regulator molecule
Positive: transcription occurs only if a regulator molecule directly stimulates RNA production. |
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Explain what a cis-acting site is.
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When the regulatory region is upstream on the same strand as the genes that code dor the enzymes.
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What are trans-acting elements.
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Molecules that control transcription to which cis-acting regulatory regions bind
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What are structural genes.
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genes coding for the primary strcuture of an enzyme
There are 3 in the lac operon. |
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What is the operon model?
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A group of genes is regulated and expressed together as a unit.
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Describe the lac operon.
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Has 3 structural genes; Z, Y, A and an operator region. The lacI gene
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