Microbiology
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Active repressor complex | formed when tryptophan binds to the aporepressor--binds at the beginning of the trp operator and inhibits transcription
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| Aporepressor | a separated gene from the operon produces an inactive repressor--protein is normally inactive
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| Corepressor | tryptopan--causes repression
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| Feedback inhibition | end product inhibits expression of its own pathway--many anabolic pathways directly regulate expression in this manner--ample product--system's expression repressed
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| Gene expression | prokaryotes--gene expression control seen at level of transcription--2 major classes--inducible/repressible
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| Inducible genes | normally turned off--unless energy source is available in environment
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| Induction | (blank)
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| lac operon | features that control expression--3 proteins encoded by lac operon--lacZ, lacY, lacA--efect lactose catabolism (degredation)
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| Operator | (lacO) binding site of protein to a specific DNA
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| Promoter | (lacP)
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| Repressible systems | can be turned off at the transcriptional level when it is advantageous to the cell
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| Repressor | protein that binds to a specific DNA sequence just upstream of the 3 cistrons of the lac operon
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