1. Virus vs. Bacterium
MT: Immune System
Vs.

2. Characteristics of a Virus
3 different shapes (spherical, rod, icosahedral)
microscopic; 1/100 size of bacterium
Has genetic material (DNA or RNA)
Surrounded by a protein coat called a capsid
No nucleus
Proteins on outside to communicate to other cells

3. 3 Shapes of a Virus
Spherical
Icosahedral
Rod

4. Guess their shape:
adenovirus
HIV
T4 phage
Chicken pox
Herpes
H1N1

5. Treatment of a Virus
Antiviral drugs: can stop transcription of viral proteins
Vaccine
Wait for body to produce antibodies

6. Reproduction of a Virus
Cannot reproduce without a host
Uses a host cell to go through transcription and translation
Lytic or Lysogenic cycles (next slide)

7. Lytic Cycle Lysogenic Cycle Virus inserts genes into cell’s genes
Transcription/translation occurs in cell to make viral proteins
Cell lyses (splits) and viruses released to infect other cells
Lysogenic Cycle
Cell can multiply and incorporate viral genes into new cells
Viral genes stay dormant in new cells but change in environment can cause lytic cycle to begin

8. Lytic CyCLE
Lysogenic CyCLE

9. Shapes of a Bacterium 100 x bigger than virus 3 different shapes
cocci (spherical)
bacilli (rod),
spirilla (spiral)

10. Guess their shape:
Salmonella
E. Coli
streptococcus

11. Characteristics of a Bacterium
No nucleus
Genetic material (DNA or RNA) floats in cytoplasm
Have a cell wall
May have flagella to move around
Proteins on outside to communicate with other cells

12. Treatment of Bacteria
Antibiotic drugs: destroy the cell membrane of bacterium

13. Reproduction of Bacteria
Binary Fission: making a clone
Conjugation: tube from one bacterium inserts genes into other bacterium
Spores: tiny dormant seeds

14. C/C Virus v. Bacterium using:
Shapes
Genetic material
Size
Contents inside
Protection from outside
How communicate with other cells