Term
Several ways Prokaryotic cell can shut off the supply of unneeded protein |
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Definition
- Downregulate the transcription of mRNA for that protein
- Hydrolyze the mRNA after it is made, thereby preventing translation
- Prevent translation of the mRNA at the ribosome
- Hydrolyze the proteinafter it is made
- Inhibit the function o the protein
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Term
Three proteins are involved in the initial uptake and metabolism of lactose by E. coli |
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Definition
- β-galactoside permease is a carrier protein in the bacterial plasma membrane that moves the sugar into the cell.
- β-galactosidase is an enzyme that hydrolyses lactose to glucose and galactose.
- β-galactoside transacetylase transfers acetyl groups from acetyl CoA to certain β-galactosides. Its role in the metabolism of lactose is not clear.
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Term
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Definition
| Compounds that, like lactose, stimulate the synthesis of a protein |
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Definition
| A protein that is produced only in the presence of a particular compound or under particular circumstances. |
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Definition
| proteins that are made all the time at a constant rate |
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Definition
| A gene that encodes the primary structure of a protein not involved in the regulation of gene expression.example: lactose in E. coli |
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Definition
| A genetic unit of transcription, typically consisting of several structural genes that are transcribed together; the operon contains at least two control regions: the promoter and the operator. |
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Definition
| The region of an operon that acts as the binding site for the repressor. |
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Definition
| the operon that encodes the three lactose-metabolizing enzymes in E. coli |
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Definition
| A protein encoded by a regulatory gene that can bind to a specific operator and prevent transcription of the operon. |
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Definition
| A gene that codes for a protein (or RNA) that in turn controls the expression of another gene. |
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Term
The lac Operon: An Inducible System |
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Definition
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Term
Two Ways to Regulate a Metabolic Pathway |
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Definition
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Term
The promoter in the lac operon |
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Definition
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Definition
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Definition
| In the presence of abundant glucose, the diminished synthesis of catabolic enzymes for other energy sources. |
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Term
Table of activity of transcription of lac genes to lactose and glucose present |
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Definition
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