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9 Cards in this Set
- Front
- Back
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What are the two types of enzymes?
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Constitutive and Inducible
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What is an example of polycistronic mRNA?**
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The genes for beta-galactosidase, galactoside permease and thiogalactoside transacetylase,
-belong to single operon -lie next to each other on chromosome -are transcribed into single mRNA molecule |
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What genes do cis and trans-acting mutations affect?
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Cis - occur in DNA regions that do not code for any product
Trans - affect genes that produce a product |
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What is negative gene control?
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Eg. is a repressor that must be removed from DNA to allow transcription to occur.
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What is positive gene control?
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Eg is sigma factor that activates RNA polymerase to allow transcription initiation
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What must the repressor bind to first before it can bind to an operator?
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the corepressor
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What is transcription attenuation in the tryptophan operon?
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mRNA synthesis is aborted prematurely at this site if the level of tryptophan rises above a certain level.
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What are the two modes of growth of phage lambda?
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Lytic (phage replication leading to lysis of the cell) and lysogenic (phage genome gets integrated into bacterial chromosome and becomes genetically repressed)
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What is a genetic switch?
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Gene that regulates its own synthesis and repressese owth syntheses.
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