1. VIRUS

2. VIRUS
A minute, biologically active particle made up of a nucleic acid core (as a genetic material) and a protein covering (capsid)
It is not a cell (not capable of carrying cellular processes).

3. Obligate intracellular parasites
Virus
Biological particle
Capsid - protein
Acellular level
Obligate intracellular parasites

4. Classification As to their host cells
- plant viruses - bacterial viruses
- animal/human viruses
B. As to their symptoms
- virulent – causes a disease
- temperate – does not cause a disease immediately
C. As to nucleic acid core
- DNA viruses
- RNA viruses

11. Structure:
Capsid – protein coat
Membranous envelope- surrounds the protein coat
Nucleic acid core – hereditary material

12. Viral Replication (Reproduction)
1. Lytic Cycle
- the virus replicates and ruptures the host cell.
2. Lysogenic Cycle
- the viral genetic material is incorporated into the host’s DNA.
- killing of the host cell is not necessary

15. Common Viral diseases Warts 6. polio Chicken pox 7. colds
Influenza Rabies
Mumps Viral
5.Measles pneumonia

16. Other viral . . . . HIV – AIDS - retrovirus - reverse transcriptase
- RNA – DNA - RNA

20. Small pox

21. Polio

22. Measles

23. Mumps