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Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
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Tutti i libri di testoSanders 3rd EditionCh. 6 - Genetic Analysis and Mapping in Bacteria and BacteriophagesProblema 8
Capitolo 6, Problema 8

What is a prophage, and how is a prophage formed?

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A prophage is a form of a bacteriophage (a virus that infects bacteria) where the viral DNA is integrated into the bacterial host's genome. It remains dormant and does not cause immediate lysis of the host cell.
The formation of a prophage begins when a bacteriophage infects a bacterial cell and injects its DNA into the host.
Once inside the bacterial cell, the viral DNA can either enter the lytic cycle (leading to the destruction of the host cell) or the lysogenic cycle, where it integrates into the bacterial genome.
During the lysogenic cycle, the viral DNA integrates into the bacterial chromosome through a process called site-specific recombination. This integration is facilitated by enzymes encoded by the bacteriophage, such as integrase.
After integration, the viral DNA becomes a prophage and is replicated along with the bacterial genome during cell division. It remains dormant until certain conditions trigger its reactivation, leading to the lytic cycle.

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Prophage Definition

A prophage is a form of a bacteriophage (a virus that infects bacteria) that has integrated its genetic material into the host bacterium's chromosome. This integration allows the viral DNA to be replicated along with the host's DNA during cell division, remaining dormant until certain conditions trigger its activation.
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Lysogenic Cycle

The lysogenic cycle is one of the two main life cycles of bacteriophages, where the virus integrates its DNA into the host genome, forming a prophage. During this cycle, the prophage can remain inactive for long periods, allowing the host bacterium to reproduce normally while carrying the viral genetic material.
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Decision Between Lytic and Lysogenic Cycles

Induction of Prophage

Induction is the process by which a prophage is activated to enter the lytic cycle, leading to the production of new viral particles. This can occur due to various environmental factors, such as stress or damage to the host cell, which trigger the prophage to excise itself from the host genome and begin replicating.
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Pratica correlata
Domanda del libro di testo

Among the mechanisms of gene transfer in bacteria, which one is capable of transferring the largest chromosome segment from donor to recipient? Which process generally transfers the smallest donor segments to the recipient? Explain your reasoning for both answers.

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Domanda del libro di testo

Describe the differences between genetic complementation and recombination as they relate to the detection of wild-type lysis by a mutant bacteriophage.

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Domanda del libro di testo

Describe what 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.

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Domanda del libro di testo

Describe the difference between the bacteriophage lytic cycle and lysogenic cycle.

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Domanda del libro di testo

Explain the importance of the following features in conjugating donor bacteria:

pilin protein

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Domanda del libro di testo

How is the frequency of cotransduction related to the relative positions of genes on a bacterial chromosome? Draw a map of three genes and describe the expected relationship of cotransduction frequencies to the map.

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