CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
3rd Edition
ISBN: 9780136811206
Author: Urry
Publisher: SAVVAS L
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Textbook Question
Chapter 15.1, Problem 2CC
Describe the binding of RNA polymerase, repressors, and activators to the lac operon when both lactose and glucose are scarce. What is the effect of these scarcities on transcription of the lac operon?
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Describe the binding of RNA polymerase, repressors, andactivators to the lac operon when both lactose and glucose are scarce. What is the effect of these scarcities ontranscription of the lac operon?
Explain why inactivation of the O1 sequence of the lac operator almost completely abolishes repression of the lac operon.
Describe the mechanism by which cAMP receptorprotein (CRP), the regulatory protein for catabolite repression, functions. Use the lactose operon as an example.
Chapter 15 Solutions
CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
Ch. 15.1 - How does binding of the trp corepressor to its...Ch. 15.1 - Describe the binding of RNA polymerase,...Ch. 15.1 - WHAT IF? A certain mutation in E. coli changes the...Ch. 15.2 - Prob. 1CCCh. 15.2 - Compare the roles of general and specific...Ch. 15.2 - Prob. 3CCCh. 15.3 - WHAT IF? Suppose the mRNA being degraded in Figure...Ch. 15.3 - MAKE CONNECTIONS Inactivation of one of the X...Ch. 15.4 - Prob. 1CCCh. 15.4 - WHAT IF? Study the microarray in Figure 15.17. If...
Ch. 15 - If a particular operon encodes enzymes for making...Ch. 15 - The functioning of enhancers is an example of A. a...Ch. 15 - Which of the following is an example of...Ch. 15 - Prob. 4TYUCh. 15 - Prob. 5TYUCh. 15 - Which of the following would not be true of cDNA...Ch. 15 - Prob. 7TYUCh. 15 - SCIENTIFIC INQUIRY Imagine you want to study one...Ch. 15 - FOCUS ON EVOLUTION DNA sequences can act as tape...Ch. 15 - FOCUS ON INTERACTIONS In a short essay (100150...Ch. 15 - Prob. 11TYU
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- The lac operon consists of regulatory regions such as the promoter as well as the structural genes lacZ, lacY, and lacA, which code for proteins involved in lactose metabolism. What would be the outcome of a mutation in lacA?arrow_forwardWhat would happen if the operator sequence of the lac operon contained a mutation that prevented the repressor protein from binding the operator? (Explain what would happen both in the presence and absence of lactose)arrow_forwardDescribe the role of the CRP–cAMP complex in positiveregulation of the lactose operon in E. coli.arrow_forward
- Explain the role of CAP and cAMP in the regulation of the lac-operon.arrow_forwardDescribe the probable genetic defect that abolishes the sensitivity of the lac operon to the absence of glucose when other metabolic operons continue to be sensitive to the absence of glucose.arrow_forwardExplain the process of attenuation of the trp operon under high tryptophan levels.arrow_forward
- If glucose is not available, but lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon?arrow_forwardMutation in the regulatory gene in the lac operon results in the formation of an inactive repressor. List and explain the effect of such a mutation on the expression of the structural gene for lactose in E.coli?arrow_forwardWhy it is essential to the positive stimulation of transcription of the lac operon ?arrow_forward
- If glucose levels in the cell are high and lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon?arrow_forwardSupply the words “off" or “on" in the blanks below: In an inducible operon, transcription is normally and must be turned In a repressible operon, transcription is normally and must be turned Briefly describe the overall function of the structural genes in the lac operon. Briefly describe the overall function of the structural genes in the trp operon. For the following descriptions of the bacterial lac operon, determine if lactose is present (P) or absent (A). The repressor is bound to the operator. The repressor is inactive. RNA polymerase transcribes the structural genes. Allolactose is bound to the repressor For the following descriptions of the bacterial trp operon, determine if tryptophan levels are high (H) or low (L). The repressor is bound to the operator. The repressor is inactive. RNA polymerase transcribes the structural genes. Tryptophan is bound to the repressor.arrow_forwardIn the lac operon (below), how will expression of the genes lacZ and lacy be effect by a mutation in the repressor protein (encoded by lach) that prevents it from binding the operator sequence (lacO) in the absence of lactose? Explain the answerarrow_forward
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