Pearson eText Genetic Analysis: An Integrated Approach -- Instant Access (Pearson+)
3rd Edition
ISBN: 9780135564172
Author: Mark Sanders, John Bowman
Publisher: PEARSON+
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Chapter 6, Problem 10P
Describe the differences between genetic complementation and recombination as they relate to the detection of
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Consider the phase variation of flagella in Salmonella. Describe the phenotype of a cell in which hin is deleted. Will it be motile? Will it undergo phase variation? Which flagellin(s) will be used, if any? Name two bacterial defenses against bacteriophages and explain how they work How might a phage evolve resistance to the CRISPR host defense?
Shown below are the complementation test results involving 4 independently isolated lethal mutants in a bacteriophage. Complementation was assayed by simultaneouly infecting bacteria with two phage strains, each with a different mutation, neither of which could alone lyse the cells. In the table below, a "+" indicates the strains complemented each other and therefore lysed open the bacteria. A "0" indicates no complementation and therefore no cell lysis occurred.
Test pair Results 1___2___3___4
1,2 + 1 0 + + 0
1,3 + 2 0 + +
1,4 0 3 0 +
2,3 + 4 0
2,4 +
3,4 +
Which mutants are in the same gene?
.
a. 2, & 3
b.1, 2, 3 & 4
c.1 & 4
d.1, 2 & 4
In 1944, Avery, Macleod, and McCarty provided strong evidence that DNA is the hereditary material in Streptococcus pneumoniae by
Group of answer choices
showing that avirulent cells could become virulent by the process of transduction
none of these is true.
showing that virulent cells could become avirulent if the DNA was destroyed after transformation
showing that avirulent cells could not gain the ability to become virulent cells if conjugation was interrupted.
showing that avirulent cells could not gain the ability to become virulent if DNA was destroyed after transformation.
Chapter 6 Solutions
Pearson eText Genetic Analysis: An Integrated Approach -- Instant Access (Pearson+)
Ch. 6 - For bacteria that are F+, Hfr, F', and F-, perform...Ch. 6 - The flow diagram identifies relationships between...Ch. 6 - Conjugation between an Hfr cell and an F-cell does...Ch. 6 - Bacteria transfer genes by conjugation,...Ch. 6 - Explain the importance of the following features...Ch. 6 - Prob. 6PCh. 6 - Describe what is meant by the term site-specific...Ch. 6 - What is a prophage, and how is a prophage formed?Ch. 6 - How is the frequency of cotransduction related to...Ch. 6 - Describe the differences between genetic...
Ch. 6 - Among the mechanisms of gene transfer in bacteria,...Ch. 6 - What is lateral gene transfer? How might it take...Ch. 6 - Lateral gene transfer is thought to have played a...Ch. 6 - Prob. 14PCh. 6 - A 2013 CDC report identified the practice of...Ch. 6 - Hfr strains that differ in integrated F factor...Ch. 6 - Five Hfr strains from the same bacterial species...Ch. 6 - An interrupted mating study is carried out on Hfr...Ch. 6 - An Hfr strain with the genotype cys+leu+met+strS...Ch. 6 - A triple-auxotrophic strain of E. coli having the...Ch. 6 - Penicillin was first used in the 1940 s to treat...Ch. 6 - An attribute of growth behavior of eight...Ch. 6 - Synthesis of the amino acid histidine is a...Ch. 6 - The phage P1 is used as a generalized transducing...Ch. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Look closely at the consolidated Hfr map and the...Ch. 6 - Fifty bacterial colonies are on a complete-medium...
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- Eight mutant bacteriophage strains cannot lyse a certain type of bacteria that can be lysed by wild-type bacteriophages. The mutant strains were allowed to infect the bacteria in a complementation test. A +' indicates that lysis occurred with coinfection. Aindicates that lysis did not occur. GKWTMAGC +++ +++ - -+ -| ++ + ++ + - + + M -|- +1+ A + + A cistron is defined by no complementation in the : configuration. How many genes are controlling lysis in this bacteriophage? (Use a number not a word in the space) Which of the following strains below are defective in the same gene as strain Q? Answer yes if the strain is defective or no if it is not. Strain Defective K. W A. N/Aarrow_forwardWhat is meant by the term site-specific recombination as used in identifying the processes that lead to the integration of temperate bacteriophages into host bacterial chromosomes during lysogeny or to the formation of specialized transducing phage?arrow_forwardwhen various strains of lambda phage are seeded on a lawn of e.coli, they can form clear or turbid plaques. Explain the difference between the two types of plaques. can all bacteriophage form clear and turbid plaques?arrow_forward
- Eight mutant bacteriophage strains cannot lyse a certain type of bacteria that can be lysed by wild-type bacteriophages. The mutant strains were allowed to infect the bacteria in a complementation test. A "+" indicates that lysis occurred with coinfection. A "-" indicates that lysis did not occur. GKWTMAQC G- ++++- K W T M A Q C - + +++ - ++++ - + + - + - + - - + + + A cistron is defined by no complementation in the How many genes are controlling lysis in this bacteriophage? (Use a number not a word in the space) configuration.arrow_forwardDuring the analysis of seven rII mutations in phage T4, mutants1, 2, and 6 were in cistron A, while mutants 3, 4, and 5 were incistron B. Of these, mutant 4 was a deletion overlapping mutant5. The remainder were point mutations. Nothing was knownabout mutant 7. Predict the results of complementation (+ or -)between 1 and 2; 1 and 3; 2 and 4; and 4 and 5.arrow_forwardDuring the development process of a vaccine for the newly discovered Sars-COV-2 (COVID- 19) virus, pharmaceutical companies developed two potential vaccine candidates, BNT162b2 and Ad26.COV2. Some researchers postulated that BNT162b2 will be more ef- fective than Ad26.COV2 because only BNT162b2 directly targets the protein-manufactur- ing mechanisms in the cell. To test this claim, researchers proposed an experiment in which data will be collected about the efficacy of the two vaccine candidates. In the proposed study, two groups of mice will be randomly assigned one of the vaccine candidates and then infected with the virus. Data about the severity of symptoms in each group will then be collected. Which of the following describes a potential method for measuring the dependent variable in this experimental design? A B с D measure the amount of virus administered to each group measure the time between vaccine administration and virus infection in each group measure the amount of vaccine…arrow_forward
- In recombination studies of the rII locus in phage T4, what is the significance of the value determined by calculating phage growth in the K12 versus the B strains of E. coli following simultaneous infection in E. coli B? Which value is always greater?arrow_forwardThe size of a DNA fragment that can be inserted into an unmodified λ vector is very limited. Large segment in the central region of the λ DNA molecule can be removed without affecting the ability of the phage to infect Escherichia coli cells. However, the deletion of this non- essential region does affect the life cycle of the bacteriophage. Explain this statement.arrow_forwardWhat is the difference between the lytic and lysogenic cycle of bacteriophages? In the lysogenic cycle, the phage DNA integrates itself into the host genome after penetration, and continues to biosynthesis when conditions change The host cell is not killed in the lysogenic cycle The lytic cycle occurs in the nucleus, while the lysogenic cycle occurs in the cytoplasm In the lysogenic cycle, penetration is achieved through phagocytosisarrow_forward
- Describe the differences between the F factor and Hfr transfer. Include how the donor and recipient are affected in each type of conjugation.arrow_forwarddata from several complementation experiments, involving rapid-lysis mutations in genes rIIA and rIIB of bacteriaphage. The strain designated L51 is known to have a mutation in rIIB. Using the table below, list which groups of mutations are in the rIIA gene and which groups are in the rIIB gene.arrow_forwardIf you Infect the Jurkat T lymphocyte cell line with HIV-1 strain IIIB. Lyse the infected cells at the peak cytopathic effect and isolate DNA from the whole cell lysates. What minimum biosafety Level (1-4) by the BMBL will be used for this experiment?arrow_forward
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genetic recombination strategies of bacteria CONJUGATION, TRANSDUCTION AND TRANSFORMATION; Author: Scientist Cindy;https://www.youtube.com/watch?v=_Va8FZJEl9A;License: Standard youtube license