The document discusses the characteristics, replication, and effects of viruses. It covers their size, shape, composition, classification and infectivity. It describes the differences between phages and animal viruses, and between DNA and RNA viruses. It also addresses the cytopathology and organismal effects of viruses, as well as their role in oncogenesis and tumorigenesis.

1. 1
The Viruses
 General Characteristics
Size, Shape, Classification,
Composition (NA, protein, lipid)
Infectivity (Host range & tissue tropism)
 Replication
Phages vs Animal viruses
DNA viruses vs RNA viruses
 Effects on Cells
Cytopathology, Organismal effects
Oncogenes and tumorigenesis

2. 2
The Viruses
 General Characteristics
Size:
Shape:
Composition:
Classification:
Infectivity:
Host range
Tissue tropism
 Replication
Phages vs Animal viruses
DNA viruses, RNA viruses
 Effects on Cells
Cytopathology, Organismal effects
Oncogenes and tumorigenesis

3. E. coli T- phages

4. Perspective:
Size

5. Virus Shape

7. (d) Helical

8. (e) Icosahedral

9. Viral Diversity
and
Methods used in
Classification

10. Viral
Anatomy

11. Anatomy of a
Herpes virus

12. Viral Diversity

13. Viral Diversity

14. Viral Diversity

16. 16
The Viruses
 General Characteristics
Size, Shape, Composition (NA, protein, lipid)
Classification, Infectivity (Host range & tissue tropism)
 Replication
Phages:
Lytic vs lysogenic infection, Transduction
Animal viruses:
DNA viruses vs RNA viruses, Retroviruses
 Effects on Cells
Cytopathology, Organismal effects
Oncogenes and tumorigenesis

17. General
Phage
Life
Cycle

18. Lytic
vs
Lysogenic
Cycle

19. Transduction

20. Transduction

22. Information
Flow in
Different
Viruses

23. Replication:
A DNA Virus

24. Replication:
An RNA Virus

25. Penetration

26. Penetration:
HIV virus

27. Biosynthesis:
HIV virus

28. Release

29. 29
The Viruses
 General Characteristics
Size, Shape, Composition (NA, protein, lipid)
Classification, Infectivity (Host range & tissue tropism)
 Replication
Phages vs Animal viruses
DNA viruses, RNA viruses
 Effects on Cells
Cytopathology
Organismal effects
Oncogenes and tumorigenesis

30. Cytopathology

31. Cytopathology

42. Prions:
Mechanism
of Action