The Regulation Of Gene Expression
10 Questions
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The regulation of gene expression--especially the lac operon of E. Coli.
Questions and Answers
- 1.The cluster of genes important in lactose metabolism in E. coli, along with the controlling DNA elements for these genes are known by the very brief acronym:
- A.
Lac operon
- B.
Lactose regulating gene and their control elements
- C.
Genes that regulate the breakdown of the disaccharide lactose plus the regulatory sequences near them
- D.
The regulator gene, CAP-binding site, promoter, operator, 5' UTR coding region, ß-galactosidase gene, galactoside permease gene, and transacetylase gene
- 2.In an E. coli culture growing in medium with lactose, the lac operon is on because ______ cannot bind to a DNA site adjacent to the promoter.
- 3.In the lac operon of E. coli, repressor protein binds to the ________.
- 4.When lactose in an E. coli culture, allolactose binds to the _______ .
- 5.When _________ is bound to repressor protein, repressor protein cannot bind to the operator.
- 6.The lac operon of E. coli is transcribed when:
- A.
Lactose is present.
- B.
Repressor protein is bound to the operator.
- C.
Allolactose binds to the promoter.
- D.
All of the above.
- 7.The site on the DNA where a specific protein binds that results in RNA polymerase binding to the promoter is called the _________.
- 8.A (an) ________ is a small RNA molecule that is part of a RISC and binds precisely to an mRNA and results in its cleavage.
- 9.A (an) ________ is a small RNA molecule that is part of a RISC and binds imprecisely to an mRNA and turns off its translation.
- 10.When __________ occurs, a gene's pre-mRNA can result in the synthesis of two different polypeptides.
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