DNA virus, Human adenoviruses - Respiratory infection- Adenovirus shape
Herpesviridae ( linear DNA)
DNA virus, Simplexvirus- Oral and genital herpes, Varicellovirus- Chickenpox, shingles - Herpesvirus
DNA virus, Orthopoxvirus- Smallpox, cowpox
Papovaviridae ( circular DNA)
DNA, human papilloma viruses- WArts, cervial and penile cancers, reovirus shape
DNA, Hepatitis B virus- Hepatitis B
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 assembly of newly synthesized viral components into complete virions
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)
None needed on bacteriophage, Enzymatic digestion of viral proteins on 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