Virus

1. range — The types of cells or organisms a virus is able to infect.
3. — Complete, infectious virus particle outside a cell.
6. effect (CPE) — Visible injury a virus causes in a host cell (fusion, inclusions, death).
9. classification — System that groups viruses by nucleic-acid type (DNA or RNA, single- or double-stranded) and how that genome is copied.
10. — Acellular particle that infects cells and can reproduce only inside a living host.
12. — Attachment of the virus to receptors on the host-cell surface.
13. — Clear spot on a cell or bacterial lawn where infected cells have been killed.
14. — Large cell with many nuclei formed when infected cells fuse (seen with RSV).
15. 2 — Effects, other agents, and HIV/therapy
16. — Lipid membrane some viruses steal from the host; often has spikes for attachment.
17. — Infectious protein with no nucleic acid; causes CJD and mad-cow disease.

2. intracellular parasite — Must invade a specific host cell and use that cell’s machinery to make new copies.
4. — Virus that infects bacteria; often used to study lytic vs. lysogenic cycles.
5. — Co-receptor HIV uses to enter helper T cells; people who lack it are highly resistant.
7. — Change of a normal cell into a cancer cell caused by an oncogenic virus.
8. — Naked circular RNA that infects plants (no capsid).
11. — Protein coat surrounding the viral genome.