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In conjugation involving the F plasmid of Escherichia coli, how isthe host chromosome mobilized?

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter20: Viruses, Bacteria, And Archaea

Section: Chapter Questions

Problem 6SQ

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Concept explainers

Genetic Recombination

Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.

Microbial Genetics

Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.

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In conjugation involving the F plasmid of Escherichia coli, how is
the host chromosome mobilized?

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As described in Figure, host DNA is hydrolyzed into smallpieces, which are occasionally assembled with phage proteins, creatinga phage with bacterial chromosomal DNA. If the breakage ofthe chromosomal DNA is not random (i.e., it is more likely tobreak at certain spots as opposed to other spots), how might nonrandombreakage affect cotransduction frequency?
describe F plasmid
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2 3 inte tion of Lormhda. ne att si ucated betwee de ne att sites and go ns one te n vacter aged ot utilize doot ractose ato la t don s gal* uc Integration to form prophage om SOward cor coct some cro on! ni imple ex 2 3 bio* gal* 14. The figure provided portrays the integration of Lambda phage into a host chromosome at the att site, located between the gal+ and bio+ genes. This prophage may disintegrate from the host carrying with it host genes, such as gal+ and/or bio+ and go on to transduce another host bacterium. How would one determine if a gal- host bacterium's phenotype was changed from gal- to gal+? To clarify, the minus version cannot utilize galactose as a carbon source for growth because it does not produce galactase, the enzyme that hydrolyzes galactose into monomeric sugars. There is a straight forward answer/solution to this – do not concoct some crazy solution! Think simple experiment.
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An ade+ arg+ cys+ his+ leu+ pro+ bacterial strain is knownto be lysogenic for a newly discovered phage, but the siteof the prophage is not known. The bacterial map isleucysarghisadeproThe lysogenic strain is used as a source of the phage, andthe phages are added to a bacterial strain of genotypeade- arg- cys- his- leu- pro-. After a short incubation,samples of these bacteria are plated on six differentmedia, with the supplementations indicated in thefollowing table. The table also shows whether colonieswere observed on the various media.PresenceMedium Ade Arg Cys His Leu Pro of colonies1 - + + + + + N2 + - + + + + N3 + + - + + + C4 + + + - + + N5 + + + + - + C6 + + + + + - NNutrient supplementation in medium(In this table, a plus sign indicates the presence of anutrient supplement, a minus sign indicates that asupplement is not present, N indicates no colonies, and Cindicates colonies present.)a. What genetic process is at work here?b. What is the approximate locus of the prophage?
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