Module 8 Lec 3 Flashcards
When do temperate phages switch from lysogenic to lytic?
Lysis can be triggered by environmental stress or specific conditions..
What is generalized transduction?
he process where bacterial DNA is accidentally packaged into a virus during the lytic cycle
What is the life cycle of a temperate phage?
Can undergo either a lytic or lysogenic life cycle, depending on conditions.
What is the life cycle of a virulent phage?
Always undergoes a lytic life cycle, killing the host.
What are the two types of bacteriophages?
Virulent and temperate phages.
What are bacteriophages?
Viruses that infect bacteria.
What happens during generalized transduction?
Pieces of host bacterial DNA are packaged into new virus particles and transferred to new bacterial cells.
How does generalized transduction occur?
During the lytic cycle, instead of viral DNA, host chromosome fragments are packaged into phages.
What is the result when a transducing phage infects another bacterium?
It transfers bacterial DNA into the new host, potentially causing genetic change.
What is specialized transduction?
The transfer of specific bacterial genes via a prophage that excises incorrectly.
How does specialized transduction occur?
A prophage excises incorrectly, packaging bacterial DNA along with viral DNA, which is then transferred to a new host.
What causes specialized transduction?
Abnormal excision of a prophage, leading to the packaging of both viral and adjacent bacterial genes.
What does a specialized transducing phage carry?
Specific bacterial genes that were adjacent to the prophage insertion site.
What is a specialized transducing phage?
A defective phage that contains bacterial DNA but lacks some viral genetic material.
Are all specialized transducing phages in a cell identical?
yes, all specialized transducing phages in a cell are identical.
