Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Textbook Question
Chapter 18.1, Problem 2CC
Describe the binding of RNA Polymerase, repressors, and activators to the lac operon when both lactose and glu- cose are scarce. What is the effect of these scarcities on transcription of the lac operon?
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Describe the mechanism by which cAMP receptorprotein (CRP), the regulatory protein for catabolite repression, functions. Use the lactose operon as an example.
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?
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?
Chapter 18 Solutions
Campbell Biology: Custom Edition
Ch. 18.1 - How does binding of the trp corepressor to the trp...Ch. 18.1 - Describe the binding of RNA Polymerase,...Ch. 18.1 - WHAT IF? A certain mutation in E. coli changes...Ch. 18.2 - In general, what are the effects of histone...Ch. 18.2 - MAKE CONNECTIONS Speculate about whether the same...Ch. 18.2 - Compare the roles of general and specific...Ch. 18.2 - Once mRNA encoding a particular protein reaches...Ch. 18.2 - WHAT IF? Suppose you compared the nucleotide...Ch. 18.3 - Compare miRNAs and siRNAs, including their...Ch. 18.3 - WH AT IF? Suppose the mRNA being degraded in...
Ch. 18.3 - MAKE CONNECTIONS Inactivation of one of the X...Ch. 18.4 - MAKE CONNECTIONS As you learned in Chapter 12,...Ch. 18.4 - MAKE CONNECTIONS Explain how the signaling...Ch. 18.4 - How do fruit fly maternal effect genes determine...Ch. 18.4 - Prob. 4CCCh. 18.5 - Prob. 1CCCh. 18.5 - Under what circumstances is cancer considered to...Ch. 18.5 - MAKE CONNECTIONS The p53 protein can activate...Ch. 18 - Compare and contrast the roles of a corepressor...Ch. 18 - Describe what must happen in a cell for a gene...Ch. 18 - Why are miRNAs called noncoding RNAs? Explsin how...Ch. 18 - Describe the two main processes that cause...Ch. 18 - Compare the usual functions of proteins encoded by...Ch. 18 - If a particular operon encodes enzymes for making...Ch. 18 - Muscle cells differ from nerve cells mainly...Ch. 18 - The functioning of enhancers is an example of (A)...Ch. 18 - Cell differentiation always involves (A)...Ch. 18 - Which of the following is an example of...Ch. 18 - What would occur if the repressor of an inducible...Ch. 18 - Absence of bicoid in mRNA from a Drosophila egg...Ch. 18 - Which of the following statements about the DNA in...Ch. 18 - Within a cell, the amount of protein made using a...Ch. 18 - Prob. 10TYUCh. 18 - draw it The diagram below shows five genes,...Ch. 18 - Prob. 12TYUCh. 18 - Prob. 13TYUCh. 18 - SCIENCE. TECHNOLOGY, AND SOCIETY Trace amounts of...Ch. 18 - WRITE ABOUT A THEME: INTERACTIONS In a Short essay...Ch. 18 - SYNTHESIZE YOUR KNOWLEDGE The flashlight fish has...
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- Describe the role of the CRP–cAMP complex in positiveregulation of the lactose operon in E. coli.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_forwardWhy it is essential to the positive stimulation of transcription of the lac operon ?arrow_forward
- Mutation 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_forwardExplain the role of CAP and cAMP in the regulation of the lac-operon.arrow_forwardIn terms of the efficient use of bacterial resources, explain why it is necessary for lac operon expression to be controlled both by the lac repressor and by a cyclic AMP receptor protein rather than just by the lac repressor alone.arrow_forward
- Describe 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_forwardWhen referring to attenuation in the regulation of the trp operon it would be safe to say that, when there are high levels of tryptophan available to the organism, transcription termination at the attenuator region is likely the ribosomes stall during translation of the attenuator region translation termination of the trp operon is likely the trp operon is transcribed at relatively high levels tryptophan inactivates the repressor proteinarrow_forwardA number of mutations affect the expression of the lac operon in E. coli. Consider each genotype below and complete the table using “+” to indicate that the gene is expressed, and “−” to indicate that gene is not expressed.arrow_forward
- The L-arabinose operon, also called ara, is an operon required to break down the sugar L-arabinose in E. coli. This operon contains 3 structural genes in the following order, araB, araA, araD and expression is controlled by the product of a repressor called araC and the CAP protein which is regulated by cAMP in the same way as it is for the lactose operon. Now Draw a schematic of what this operon might look like when glucose levels are low and arabinose levels are high. Include the relevant proteins and their effector molecules, the promoter, operator, and structural genes. Note if the operon is being transcribed or not.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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