Brock Biology of Microorganisms, Books a la Carte Edition (14th Edition)
14th Edition
ISBN: 9780321928351
Author: MADIGAN, Michael T., Martinko, John M., Brock, Thomas, Bender, Kelly S., BUCKLEY, Daniel H., Stahl, David A.
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 5AQ
Many amino acid biosynthetic operons under attenuation control are also under negative control. Considering that the environment of a bacterium can be highly dynamic, what advantage could be conferred by having attenuation as a second layer of control?
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Many amino acid biosynthetic operon under attenuation control are also under negative control. Considering that the environment of a bacterium can be highly dynamic, what advantage could be conferred by having attenuation as a second layer of control?
Many amino acid biosynthetic operons under attenuationcontrol are also under negative control. Considering that theenvironment of a bacterium can be highly dynamic, whatadvantage could be conferred by having attenuation as asecond layer of control?
Why trp operon has a higher level of expression than live operon in bacteria grown on nutrient-poor agar plates? Explain with clear reasoning
Chapter 7 Solutions
Brock Biology of Microorganisms, Books a la Carte Edition (14th Edition)
Ch. 7.1 - Prob. 1MQCh. 7.1 - Prob. 2MQCh. 7.1 - Prob. 3MQCh. 7.2 - What is protein domain?Ch. 7.2 - Why are most DMA-binding proteins specific to...Ch. 7.3 - Why is negative control so named?Ch. 7.3 - How does a repressor inhibit the synthesis of a...Ch. 7.4 - Prob. 1MQCh. 7.4 - Prob. 2MQCh. 7.5 - Prob. 1MQ
Ch. 7.5 - Prob. 2MQCh. 7.5 - Explain how the lac operon is both positively and...Ch. 7.6 - What is the major difference between...Ch. 7.6 - How do transcriptional activators in Archaea often...Ch. 7.7 - What are kinases and what is their role in...Ch. 7.7 - Prob. 2MQCh. 7.8 - What are the primary response regulator and the...Ch. 7.8 - Why is adaptation during chemotaxis important?Ch. 7.8 - How does the response of the chemortaxis system to...Ch. 7.9 - Prob. 1MQCh. 7.9 - Prob. 2MQCh. 7.10 - Prob. 1MQCh. 7.10 - Prob. 2MQCh. 7.10 - Prob. 3MQCh. 7.11 - How are different sets of genes expressed in the...Ch. 7.11 - Prob. 2MQCh. 7.12 - Why are the levels of DnaA protein controlled...Ch. 7.12 - Prob. 2MQCh. 7.14 - Prob. 1MQCh. 7.14 - Prob. 2MQCh. 7.15 - What happens when a riboswitch binds the small...Ch. 7.15 - What are the major differences between a repressor...Ch. 7.16 - Why does attenuation control not occur in...Ch. 7.16 - Prob. 2MQCh. 7.17 - What is feedback inhibition?Ch. 7.17 - Prob. 2MQCh. 7.18 - Prob. 1MQCh. 7.18 - Prob. 2MQCh. 7 - Prob. 1RQCh. 7 - Describe why a protein that binds to a specific...Ch. 7 - REVIEW QUESTIONS
3. Most biosynthetic operons need...Ch. 7 - What is the difference between an operon and a...Ch. 7 - Prob. 5RQCh. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Adaptation allows the mechanism controlling...Ch. 7 - How can quorum sensing be considered a regulatory...Ch. 7 - Prob. 10RQCh. 7 - Prob. 11RQCh. 7 - Prob. 12RQCh. 7 - Prob. 13RQCh. 7 - Prob. 14RQCh. 7 - Prob. 15RQCh. 7 - Prob. 16RQCh. 7 - Prob. 17RQCh. 7 - Application Questions
1. What would happen to...Ch. 7 - Prob. 2AQCh. 7 - Prob. 3AQCh. 7 - Most of the regulatory systems described in this...Ch. 7 - Many amino acid biosynthetic operons under...Ch. 7 - How would you design a regulatory system to make...
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- Which of the following lac operon genotypes would allow for functional versions of all the structural enzymes of the lac operon to be expressed constitutively even in the absence of lactose? Group of answer choices I+ O+ Z+ Y+ A+ I- O+ Z- Y- A- I+ OC Z+ Y+ A+ IS O+ Z+ Y+ A+ I+ O+ Z- Y+ A+arrow_forwardWould a mutation that inactivated lac repressor and prevented it from binding to the lac operator site result in the constitutive expression of the lac operon under all conditions? Explain. What is the disadvantage to the bacterium of having a constitutive lac operon?arrow_forwardWhat would happen if the operator sequence of the trp operon contained a mutation that prevented the repressor protein from binding to the operator? (Explain what would happen in both the presence and absence of tryptophan)arrow_forward
- Why is it beneficial for the bacterium to regulate the lac operon with both a repressor protein and an activator protein?arrow_forwardLet’s suppose you have isolated a mutant strain of E. coli in which the lac operon is constitutively expressed. In other words, the operon is turned on in the presence or absence of lactose. One possibility is that the mutation mayblock the transcription of the lacI gene, thereby preventing the synthesis of lac repressor. A second possibility is that the mutation could alter the sequence of the lac operator in a way that prevents lac repressor from binding to the operator. How would you distinguish between these two possibilities?arrow_forwardLet’s suppose you have isolated a mutant strain of E. coli in which the lac operon is constitutively expressed. In other words, the operon is turned on in the presence or absence of lactose. One possibility is that the mutation may block the transcription of the lacI gene, thereby preventing the synthesis of lac repressor. A second possibility is that the mutation could alter the sequence of the lac operon in a way that prevents the repressor protein from binding to the operator. How would you distinguish between these two possibilities?arrow_forward
- Given the following genotypes, explain, by answering the questions in each number, how the mutation (identified by a (-) superscript) will affect E. coli grown in lactose medium. Will there be a complete set ofgene products? (Yes/No) Will the lac operon be turnedon/off? Will the cell survive? (Yes/No) a. i + p + o + z - y + b. i + p - o + z + y + c. i + p + o - z + y +arrow_forwardSuppose that E. coli sustains a mutation in its gene for the lac operon depressor making the repressive ineffective. How would this mutation affect the bacterium's ability to catabolize lactose? Would the mute to strain have an advantage over the wild-type strain?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_forward
- Give all possible genotypes of a lac operon that produces, or fails to produce, β-galactosidase and permease under the following conditions. Do not give partial-diploid genotypes. Lactose absent Lactose present β-Galactosidase Permease β-Galactosidase Permease a. − − + + b. − − − + c. − − + − d. + + + + e. − − − − f. + − + − g. − + − +arrow_forwardA mutant strain of E. coli has a premature stop mutation in the lacZgene, resulting in a non-functional b-galactosidase. Otherwise, all other parts of the operon are functional. Which component of an F' plasmid will restore normal regulation and function of the lac operon in the resulting partial diploid?arrow_forwardWhat are the effects of the following conditions on Lac operon of bacteria? Please do not forget to mention about the role of repressor, activator, RNA polymerase in each case. Glucose is absent and lactose is present Glucose is present and lactose is present Glucose is present and lactose is absentarrow_forward
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