Properties of Viruses
Nucleic acid can be double DNA, single DNA, Single RNA, or double RNA
Structure consist of protein shell (capsid) surrounding nucleic acid core
Lack enzymes and most metabolic processes
Fully formed virus able to establish an infection
What is the general structure of a virus
a) Covering; capsid or envelope(not found in all viruses)
b)Central Core; Nucleic acid (DNA or RNA) or matrix proteins enzymes (not found in all viruses)
All viruses have
Capsids - Protein coats that enclose and protect their nucleic acid
Identical subunits that are made of proteins
The capsid paired with nucleic acid
Not found in all viruses
Mostly in animal viruses
Viruses not containing envelopes are called?
When are envelopes acquired?
When the virus leaves the host cell
Exposed proteins on the outside of the envelope.
Essential for attachment of the virus to the host cell
AKA atypical viruses
Some bacteriophages(viruses) have a polyhedral nucelocapsid along with a helical talk and attachment fibers
They lack a typical capsid and have an unusual shape
Either DNA or RNA but never both
Carries genes necessary to invade host cells and redirect cells activity to make new viruses
Synthesis of DNA from RNA
Some viruses use what to help replicate?
Polymerases and replicases
6 phases of animal virus multiplication
Binding of virus to molecule on host cell
Genome enters host cell
Viral nucleic acid is realeased from capisd
Viral compnents are produced
New viral particals constructed
assembled viruses are released by budding(Exocytosis) or lysis.
Virus induced damage to cells
Changes in shape/size
Transform to cancerous cells
Viral infection of human liver cells
Viral infection of intestinal and nerve cells
Viral infection to various cells of many mammals