1. Etiology: study of disease cause
2. Required components for viruses: capsid(attach), genetic material
3. Optional virus components: envelope(attach,can be required structure), spikes(attachment),
proteins/enzymes
4. Capsid:protein coat surrounding a nucleic acid core
5. Viral Genetic Material: DNA/ RNA, double strand or single strand, several linear molecules or single
circle
6. Envelope: phospholipid bilayer, provides protection/ attachment sites, doesn't play CM role,
surrounds nucleocapsid, make the virus a little more sensitive,determines means of vrial penetration
7. Virus characteristics: acellular infection agents , lack the ability to carry out metabolic pathways,
doesn’t reproduce independently,doesn’t individually grow in size. Can cause cancer
8. Host Cell Specificity: precise affinity of viral surface proteins/ glycoproteins for complementary
proteins/glycoproteins on host cell surface. can infect not only a particular host but also a particular
kind of cell in that host.
9. Host Range: virus inability to successfully adso