ch16_review - Klug Concepts of Genetics 8/e Chapter 16...

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Klug, Concepts of Genetics 8/e Chapter 16 MEDIA REVIEW QUESTIONS 1. Which term is used to describe enzymes that are produced only when specific  substrates are present in the environment? a. Constitutive b. Inducible c.Negatively controlled d. Repressible 2. What is the role of the  lacZ  gene product, the enzyme ß-galactosidase? 3. What is the effect on transcription of the structural and regulatory genes of the  lac  operon when lactose is present in the environment? 4. Which molecule is the true inducer of the lactose operon? 5. True or false? A mutation in the  I  gene directly affects the promoter of the  lac  operon. 6. Which of the following statements describes what occurs in a bacterial cell as a  consequence of high glucose concentrations? a. There is no effect. b. When glucose is present, the cell will convert it to lactose and use that as the  carbon source. c.When glucose is present, the levels of cyclic AMP are low, and so the  lac  operon  genes are transcribed
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d. When glucose is present, the levels of cAMP are low. CAP alone will not bind  to the CAP binding site, and so the structural genes are not transcribed. 7. When a bacterial cell is present in an environment where both lactose and glucose  are present, the glucose will be metabolized first and the lactose will be used when  the stores of glucose have been depleted. How does a bacterial cell recognize the  fact that glucose is present and turn off transcription of the  lac  genes even when  lactose is present?
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