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VIRUS (Prions :star: (A prion is protein that can cause infection
or…
VIRUS
Prions :star:
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symptoms :
causes nerve cells to burst, by creating space in the brain
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Lysogenic cycle :star:
1.in the lysogenic cycle, the viral DNA enters the nucleus of the host cell.
2.The viral genes become a permanent part of the host chromosome.
3.The genes might stay inactive for months or years until something activates them.
4.When activated, the viral genes replicate by the lytic cycle and cause active infection.
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A virus is a nonliving strand of genetic material within a protein coat.
virus is nonliving because:
1- cannot make protein
2- cannot move
3- they cannot multiply by there own
examples of viruses:
1- adenovirus: causes common cold in humans and animals
2- influenza: causes flu in humans and animals
3- bacteriophage: infects bacteria in bacteria
3- tobacco mosaic: causes diseases in tobacco leaves in plants
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- :silhouettes:HALAH M - JOUD SH - AREEB - LAMA *
