1. Viruses

2. Virus Structure
Nucleic acid encased in a protein coat (capsid)

3. Viral Replication Only reproduce when they enter a host cell
They lack ribosomes and enzymes necessary for protein synthesis and simple metabolism

4. Viral Genome Structure
dsDNA
ssDNA
dsRNA (reo)
ssRNA
Serve as mRNA (+)
Serve as template for mRNa (-)
Serve as template for DNA (retro)

5. Bacteriophages Virsus that attack bacteria
Two types of reproductive cycles
Lytic
Lysogenic

6. Lytic and Lysogenic Cycles

7. HIV is a Complex Animal Virus
CD4 receptors
Endocytosis
Reverse Transcriptase
DNA Incorporation
Produces genome for new virus
Assemble HIV particles
Exit by budding or lysis

8. Treatment AZT – Blocks replication
Protease inhibitors – blocks building of capsid

9. Treatment
Chemokines
Blocking Receptors
Defective HIV genes