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14 Cards in this Set
- Front
- Back
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A group of bacterial structural genes that are transcribed together. Regulates the expression of the structural gene by controlling transcription
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Operon
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Transcription is normally off, something must happen to induce transcription
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Inducible expression
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Transcription is always on
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Constitutive expression
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Encodes B-galactosidase
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lac Z
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Encodes lac permease
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lac Y
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Encodes trans-acetylase
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lac A
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Encodes repressor
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lac I
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Breaks down lactose and isomerizes lactose
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B-galactosidase
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A disaccharide containing glucose and galactose units (the inducer)
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Lactose
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Mutations in DNA, affect genes downstream
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Cis
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Mutations in diffusible substance, protein. Affects both plasmid and the copy that is on the chromosome
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Trans
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Promoter region
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P-lac
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Operator region
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lac-O
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System of gene control in some bacterial operons in which glucose is used preferentially and the metabolism of other sugars is repressed
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Catabolite repression
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