Bacterial Viruses Flashcards
(18 cards)
…..are obligate intracellular parasites
Viruses
Bacteriophages are ……..
Viruses that parasites bacterial cell
The head of bacteriophage consists of……
Nucleic acid( DNA or RNA ) Surrounded by protein coat
The tail consists of hollow surrounded by . …..
Contractile sheat
……is organ of attachment to the host cells
Phage tail
At What stage of lytic cycle the phage attached to the bacterial receptor?
In adsorption
All phages can be contacted by any bacteria ( T,F )
F
What happened in penetration stage ?
The tail sheat will contract and inject the DNA into the cell
The viral genome is enter the host cell after injection T,F
T
Whay in eclipse stage no phage components are detected?
Because viral DNA direct the host cell metabolism to synthesize new enzymes and new proteins for phage synthesis
At what stage are the nucleic acid and phage coat manufactured?
In intracellular synthesis
At What stage the phage becom mature ?
In assembly stage
What is outcomes of lytic cycle ?
Lysis, Tansduction
What is the prophage?
Is a part of phage DNA integrated in bacterial chromosome
…..is a bacteria carring the prophage
Lysogenic bacteria
What is outcomes of lysogenic cycle ?
1 immune to infection by another phages
2 cell may continue carrying the prophage indefinitely passing into daughter cells
3 lysogenic conversion
4 the prophage may induced to detach from bactrial chromosome and start alytic cycle
What is the difference between specialized transportation and general transportation?
Specialized transduction : is occurs when prophage is induced where a part of bacterial chromosome is carried with phage to another cell
General transduction;It occurs when a part of the bacterial cell’s DNA is packaged instead of the phage’s DNA.
