Ch14&15 - Lauren Taranow lmt827 Problems and...

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Lauren Taranow lmt827 Problems and Questions for Chapters 14 and 15 Material From Brooker, pages 386 and 387 (3 rd edition, pages 385 and 386) Answer questions C3, C15, C16, C24, and the additional questions below. C16 has been substantially altered. C3. If a gene is repressible and under positive control, describe what kind of small (effector) molecule and regulatory protein are involved. Explain how the binding of the small molecule affects the regulatory protein. The binding of an inhibitor molecule to an activator protein would occur in this gene, preventing the activator protein from binding to DNA and activating transcription. C15. What is meant by the term attenuation? Is it an example of gene regulation at the level of transcription or translation? Explain your answer. Attenuation refers to transcription stopping before reaching the end of an operon. Because it halts transcription, it is an example of gene regulation at the level of transcription. altered C16. As described in Figure 14.14, there are four regions within the trp leader sequence that can form stem-loop structures. Let’s suppose that mutations have been previously identified that prevent the ability of a particular region to form a stem-loop structure with a complementary region. For example, a region 1 mutant cannot form a 1–2 stem-loop structure but it can still form a 2–3 or 3–4 structure. A region 4 mutant can form a 1–2 or 2–3 stem-loop but not a 3–4 stem-loop. Explain the
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This note was uploaded on 02/19/2012 for the course BIO 325 taught by Professor Saxena during the Fall '08 term at University of Texas at Austin.

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Ch14&15 - Lauren Taranow lmt827 Problems and...

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