EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Textbook Question
Chapter 15.1, Problem 1CC
How does binding of the trp corepressor to its repressor alter repressor function, and transcription? What about binding of the lac inducer to its repressor?
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How could the expression of Lactase RNA be turned on and off by transcription factors, activators, and repressors?
Chapter 15 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
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 - Describe the role of complementary base pairing...Ch. 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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- What is the role of general transcription factors? GTFs bind to enhancers or silencers and regulate transcription GTFs bind to the core promoter and allow transcriptional initiation GTFs are cis-acting regulatory sequences GTFs regulate the length of the mRNA GTFs are part of the RNA polymerase II holoenzyme, and control transcription initiationarrow_forwardWhen CAMP binds to the Catabolite Activator Protein (CAP), it causes a conformational change on the protein, which results in binding to the CAP- binding site on the DNA and molecule is known as a(n) of the lac operon. This conformational change induced by the binding of another transcription activation; allosteric effect transcription repression; binding effect translation; distortion effect mutation; interactive effect attenuation; compression effect O O O Oarrow_forwardWhat is the difference between a general transcription factor (like sigma 70) and a regulatory transcription factor (like lac repressor)? Compare and contrast their roles in regulating RNA polymerase and in regulating transcription.arrow_forward
- A mutation in the trp repressor gene that prevents the apo-repressor from binding the co-repressor What is the correct option from the choices below? causes the Trp repressor to permanently bind the trp operator. leads to a high level of transcription initiation from the trp promoter, even when tryptophan is present in the medium. does not lead to a high concentration of mRNA molecules that code for the structural genes trp E, D, C, B, A, when tryptophan is present in the medium, because attenuation of the operon will still work. a and b, but not c b and c, but not aarrow_forwardExamine Figure 17.7. What would be the effect on transcription if a mutation occurred in the gene that encodes GAL3, so that no functional GAL3 was produced?arrow_forwardIf some cell-surface receptors, including Notch, can rapidly signal to the nucleus by activating latent transcription regulators at the plasma membrane, why do most cell- surface receptors use long, indirect signaling cascades to influence gene transcription in the nucleus?arrow_forward
- What role does an operator sequence serve in bacterial gene expression regulation? Describe one change in bacterial cells that can cause a repressor protein to go from inactive to active or from active to inactive.arrow_forwardHow does each of these small GTP-binding proteins contribute to the regulation of cell migration?arrow_forwardHow does the repressor protein contribute to selective expression of the structural genes Z, Y, and A in the lac operon? The repressor protein is only expressed when lactose is present. The repressor is always expressed. It blocks transcription when lactose is present. The repressor is always expressed. It allows transcription when lactose is absent. The repressor is always expressed. It blocks transcription when lactose is absent. The repressor protein is only expressed when lactose is absent.arrow_forward
- What is a positive effect of proteasome proteins being associated with transcription?arrow_forwardThe binding of a small effector molecule, protein-protein interactions, and covalent modifications are three common ways to modulate the activities of transcription factors. Which of these three mechanisms are used by steroid receptors and by the CREB protein?arrow_forwardWhat critical roles does the TFIIH CTD kinase play in regulating the switch from a pre-initiation complex to a post-initiated complex? How does the kinase affect downstream RNA processing?arrow_forward
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