1. Viruses
Viruses – particle made up of nucleic acid (DNA or RNA), protein, and in some cases lipids that can replicate only by infecting living cells
Core of DNA or RNA surrounded by protein coat (capsid), some look like little spaceships

2. Herpes
Herpes virus

3. Viruses are not alive 1) They do not maintain homeostasis
3) They do not grow.
4) They do utilize energy on their own.
5) They do not reproduce on their own.
6) They are not made of cells.
Although they DO have DNA and RNA

4. Viruses are TINY

5. Bacteriophage – virus that infects a bacteria

6. Replicative Cycles Cannot reproduce on own.

7. C. Lytic Infection 1. Virus enters cell 2. Makes copies of itself
3. Causes cell to burst

9. Lysogenic Infection Review
- Virus embeds its DNA into the DNA (genome) of the host cell & is replicated along with the host DNA
Then after numerous cell divisions acts like lytic infection and bursts cells

10. Viruses and Disease
Examples: polio, rabies, measles, AIDS, mumps, influenza, yellow fever, & common cold

11. Viruses and Disease
Best human protection: vaccines: injection with weakened virus that triggers human immune system to make antibodies.

12. Herpes Simplex ( cold sore)
65% of Americans carry this virus
Changing conditions (stress, heat, etc.) can bring about lytic cycle
Kiss me, my valentine!!