Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 18.3, Problem 2COMQ
The cl gene that encodes the λ repressor has two promoters designated
a.
b.
c.
d.
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E. coli has five genes that code for enzymes that make tryptophan. These genes
are regulated by a single promoter and transcribed as one long gene. The
presence of tryptophan shut down the production of tryptophan by the cell by
binding to the repressor. This changes the repressors shape allowing it to bind to
DNA operator, blocking RNA polymerase and cutting off the production of
tryptophan. a. Describe what woud happen to the operon if some of the cells
had a mutation on the repressor, not allowing it to bind with tryptophan. The
repressor is described as an allosteric protein. What does this mean? b. Does the
tryptophan model demonstrate an inducible or repressible operon? What is your
evidence? *
E. coli are grown on a medium containing lactose. Once glucose is added to the medium, the bacteria stop fermenting lactose. Which of the following BEST explains the observed effect?
A. Cellular levels of cAMP are lowB.Glucose is bound to the promoter
C. Repressor protein is bound to the operator
D. Repressor protein is bound to the promoter
E. coli has five genes that code for enzymes that make tryptophan. These genes
are regulated by a single promoter and transcribed as one long gene. The
presence of tryptophan shut down the production of tryptophan by the cell by
binding to the repressor. This changes the repressors shape allowing it to bind to
DNA operator, blocking RNA polymerase and cutting off the production of
tryptophan. a. Describe what would happen to the operon if some of the cells
had a mutation on the repressor, not allowing it to bind with tryptophan. The
repressor is described as an allosteric protein. What does this mean? b. Does the
tryptophan model demonstrate an inducible or repressible operon? What is your
evidence?*
Chapter 18 Solutions
Genetics: Analysis and Principles
Ch. 18.1 - 1. What is a common feature found in all viruses?...Ch. 18.1 - 2. Viral genomes can be
a. DNA or RNA.
b....Ch. 18.2 - Prob. 1COMQCh. 18.2 - Prob. 2COMQCh. 18.3 - A mutation in phage results in 10-fold greater...Ch. 18.3 - 2. The cl gene that encodes the λ repressor has...Ch. 18.4 - A viral protein that is needed to make HIV DNA is...Ch. 18.4 - Prob. 2COMQCh. 18.4 - After HIV components are made, what is the correct...Ch. 18 - 1. Discuss why viruses are considered nonliving.
Ch. 18 - What structural features are common to all...Ch. 18 - 3. What are the similarities and differences among...Ch. 18 - Prob. 4CONQCh. 18 - Prob. 5CONQCh. 18 - Prob. 6CONQCh. 18 - Prob. 7CONQCh. 18 - Prob. 8CONQCh. 18 - Prob. 9CONQCh. 18 - Prob. 10CONQCh. 18 - 11. What is a prophage, a provirus, and an...Ch. 18 - Prob. 12CONQCh. 18 - Prob. 13CONQCh. 18 - 14. With regard to promoting the lytic or...Ch. 18 - 15. How do therepressor and the cro protein affect...Ch. 18 - Prob. 16CONQCh. 18 - Figure 18.11 shows a genetic switch that controls...Ch. 18 - Prob. 18CONQCh. 18 - Prob. 19CONQCh. 18 - Explain the role of RNase H (a component of...Ch. 18 - Prob. 21CONQCh. 18 - Prob. 22CONQCh. 18 - Prob. 23CONQCh. 18 - 24. Compare and contrast the roles of fully...Ch. 18 - 25. Describe the role of the Gag polyprotein...Ch. 18 - Prob. 26CONQCh. 18 - Prob. 27CONQCh. 18 - 1. Discuss how researchers determined that TMV is...Ch. 18 - Prob. 2EQCh. 18 - What is a reconstituted virus?Ch. 18 - Following the infection of healthy tobacco leaves...Ch. 18 - Prob. 5EQCh. 18 - Prob. 6EQCh. 18 - A researcher identified a mutation in PR of phage ...Ch. 18 - Experimentally, when an E. coli bacterium already...Ch. 18 - 9. A bacterium is exposed to a drug that inhibits...Ch. 18 - This question combines your knowledge of bacterial...Ch. 18 - Prob. 1QSDCCh. 18 - 2. Certain environmental conditions such as...Ch. 18 - 3. Browse the Internet to determine the drugs that...
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- After the initial Actualization of the Cit+ phenotype, there was another alteration to the A-3 genome that resulted in increased growth (e.g. Refinement). What explained the increase in growth rate in response to Refinement? A. Increase number of transporters localized to the plasma membrane. B. Increased ability to metabolize glucose. C. Increased citric acid cycle activity. D. Altered promoter activity resulting in constitutive gene expression.arrow_forwardWhen iron is scarce, some bacteria can stop synthesis of all enzymes that require iron (Fe3+), such as superoxide dismutase (SOD). Which of the following accurately describes a mechanism for this regulation? Mark all that apply. A. Regulation occurs by an inducible operon B. When absent, the lack of iron causes the repressor to deactivate and block the promoter region for these genes C. Regulation occurs by a repressible operon D. When present, iron binds and activates the repressor proteinarrow_forwardWhat is an example where p27 kip1 can remain in the nucleus performing its inhibitory effect? A. When p27 kip1 mutant with Threonine to Alanine substitution is expressed. B. When a constitutively active Akt/PKB is expressed and interact with wild type p27 kip1 C. When a dominant-negative Akt/PKB is expressed D. A and C are correct.arrow_forward
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