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, Problem 14CONQ
With regard to promoting the lytic or lysogenic cycle, what would happen if the following genes were missing from the
A. cro
B. cI
C. cII
D. int
E. cII and cro
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Students have asked these similar questions
Define the following terms: a. lytic cycle b. prophage c. transduction d. lysogeny e. nuclocapsid
If a viral host cell has a mutation that interferes with the addition of carbohydrates to proteins (glycoproteins) during processing in the Golgi
apparatus, which of the following processes is most likely to occur?
O A. Viruses released by that host cell would have a decreased ability to infect cells than the virus that originally infected the cell.
B. The virus-encoded protease would be unable to cleave large viral proteins into smaller, functional polypeptides.
OC. The virus would be unable to replicate within the host cell.
D. Viruses released by that cell are novel and would result in infections with higher mortality rates.
The figure above shows a schematic of genes and transcription control elements from phage λ. Use this figure as an aid to help you describe the molecular events involved in:
a) The establishment of lysogeny
b) The establishment of a lytic life cycle
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The structure of a prodrug used for treating people with HIV virus (human immunodeficiency virus) and AIDS is shown below. This molecule is a precursor of a protease inhibitor that competitively inhibits HIV protease due to its resemblance to the proteolytic site of the enzyme. Which process in the viral life cycle does this inhibitor target directly ? Group of answer choices a. viral protein processing for making new viruses b. viral mRNA synthesis c. viral DNA integration into the host cell DNA d. viral DNA synthesisarrow_forwardA particular strain of λ (lambda) can lysogenize its E. coli host at 30°C, but not at 42°C. Could a temperature-sensitive mutation in the int (integrase) gene explain this phenotype? A. There is insufficient information to answer the question. B. No C. Yesarrow_forwardIn the 1953 study by Hershey and Chase A. 32P was found in supernatants after T2 infection B. 35S was found in bacterial pellets after T2 infection C. E. coli genomes were inherited after T2 infection D. RNA was excluded as THE heritable material E. T2 coats were removed with a blender after initial phage bindingarrow_forward
- Define the following terms: a. promoter b. consensus sequence c. operon d. chromatin-remodeling complex e. general transcription factorsarrow_forwardA cell infected with lambda bacteriophage can follow one of two pathways: the lytic or lysogenic pathway. Describe the similarities and differences between the structure of cI and Cro, paying particular attention to the features that allow them to carry out their different functions.arrow_forwardIf you wish to create an E. coli cell that is immune to phage lambda, which of the following genes should be incorporated into genomic DNA in the E. coli cell? Select one: a. N gene O b. Cro gene Ос. Cl gene O d. SSB genearrow_forward
- From the perspective of a bacteriophage, what is the advantage of being able to follow either a lytic or a lysogenic cycle?arrow_forwardFor bacteria that are F+, Hfr, F', and F- answer the following. a. Describe the state of the F factor. b. Which of these cells are donors? Which is the recipient? c. Which of these donors can convert exconjugants to a donor state? d. Which of these donors can transfer a donor gene to exconjugants? e. Describe the results of conjugation (i.e., changes in the recipient and the exconjugant) that allow detection of the state of the F factor in a donor strain. f. Describe a "partial diploid" and how it originates.arrow_forwardSome scientists are trying to engineer bacteriophageto treat bacterial infections in humans when theinfections do not respond to chemical antibiotics.a. What possible advantages might phage therapyhave over antibiotic therapy?arrow_forward
- Some strains of Escherichia coli bacteria have acquired the ability to produce the harmful Shiga toxin, normally produced by Shigella dysenteriae. Which statements best explain why this occurs? Mark all that apply. A. conjugation between two different species of bacteria allowed both strains of bacteria to express a virulence factor B. transformation resulted in expression of a virulence factor C. horizontal gene transfer between different species of bacteria D. transduction of a specific gene resulted in expression of new traitsarrow_forwardLet’s suppose a drug inhibits the function of the N protein. Would such a drug favor the lysogenic cycle, favor the lytic cycle, or prevent both cycles from occurring?arrow_forwardBacteria exposed to viruses incorporate sections of the virus’s DNA into the CRISPR array sequences in their genome. This mechanism allows bacteria to fight off the viruses, like an immune response: the information in CRISPR spacers served as “coordinates” for recognizing and cutting up invading DNA sequences. Describe what might happen under the conditions described after a bacteriophage infects a bacterial cell and releases its DNA into the bacterial cell. Explain why: 1. The invading phage DNA is recognized by the Cas proteins but not inserted into the CRISPR array region of the bacterial genome: The bacteria will be unable to elicit an immune response and will succumb to the phase infection 2. The cas genes on the bacterial genome contains a missense mutation that increases its cleavage/cut activityThe bacteria will elicit an immune response that will successfully fight the phage infectionarrow_forward
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