1. Chapter 25
V i r u s e s

2. V i r u s e s
They are below the cellular level of organization. Viruses are referred to as acellular
Their size is measured in nanometers.
One nanometer is one billionth of a meter.

3. A r e v i r u s e s a l i v e ?
Which of the life characteristics are shown by viruses?

4. A r e v i r u s e s a l i v e ? Composed of cells Organization
Use energy
Response
Reproduction
Adaptation

5. Structures of TMV
and Influenza Virus

6. Tour of a Virus

7. Structures of
Adenovirus and
Bacteriophage

8. Reproductive Cycle of HIV

9. Structures of Influenza Virus

10. Viral Diseases and Modes of Transmission

11. C l a s s i f y i n g T r a i t s T y p e o f n u c l e i c a c i d
T y p e o f h o s t c e l l

14. L y t i c C y c l e 1. Attach to a cell. 2. Inject nucleic acid.
3. Control the cell.
4. Produce viruses.
5. Cell ruptures.
6. Cell dies.

15. L y s o g e n i c C y c l e 1. Attach to a cell.
2. Inject nucleic acid.
3. Nucleic acid becomes part of the cell genes.
4. New genes are passed to offspring.
5. New genes stimulated and produce new trait.

16. A r e t h e y H a r m f u l ?
Virulent
Temperate

17. P a p i l l o m a v i r u s - W a r t s

18. I n f l u e n z e v i r u s - F l u

19. H u m a n I m m u n o d e f i c i e n c y V i r u s - A I D S

20. R a b i e s V i r u s