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+RNA, Rubella virus- Rubella ( German measles)
Equine encephalitis virus- Equine encephalitis
Reoviridae ( 1 copy in 10-12 segments)
Double stranded RNA, Rotavirus- Respiratory and gastrointestinal infection - Reovirus shape
Herpesviridae ( linear DNA)
DNA virus, Simplexvirus- Oral and genital herpes, Varicellovirus- Chickenpox, shingles - Herpesvirus
Papovaviridae ( circular DNA)
DNA, human papilloma viruses- WArts, cervial and penile cancers, reovirus shape
parvoviridae ( linear DNA)
Single stranded DNA viruses, B19-Fifth disease (everythema infectiousum) in children, picornavirus.
Adsorption - 1
the attachment of viruses to host cells
Is chemical attraction. It requires specific protein recognition factors found in the phage tail fibers that bind to specific receptor sites on the host cells.
the entry of virions ( or thier genome) into host cells
Enzyme lysozyme present in phage tails, weakens the bacterial cell wall.
the synthesis of new nucleic acid molecules, capsid proteins, and other viral components within host cells while using the metabolic machinery of those cells
The departure of new virions from host cells. Release generally, but not always, kills (lyses) host cells
the time from adsorption to release is called.
It varies from 20-40 minutes for different phages.
Attachment of tail fibers to cell wall proteins
Attachment of spilkes, capsid or envelope to plasma membrane protein
Injection of viral nucleic acid through bacterial cell wall
Endocytosis or fusion ( animal virus)
In cytoplasm- in cytoplasm RNA viruses or DNA viruses, bacterial synthesis ceased- host cell synthesis ceased, viral DNA or RNA replicated, formation of viral mRNA- same on animal virus
Viral components synthesized- viral component synthesized
Addition of collar, sheath, base plate and tail fibers to viral nucleic acid containing head
Insertion of viral nucleic acid into capsid
are infectious particles made of protein. Research indicates that prions are normal proteins that become folded incorrectly
parasites can be divided into , such as ticks and lice, which live on the surface of other organisms.
Most parasites are, they must spend at least soem of their life cycle in or on a host
refer to a parasite itself having parasites
such as mosquitoes, insect or many human parasitic diseases.
is a vector in which the parasite does not go through any part of tis life cycle during transit
are infected organisms that makes parasites available for transmission to other hosts.
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