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9 Cards in this Set

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