1. VIRAL REPRODUCTION TEKS 4C:
The student knows that cells are the basic structures of all living things with specialized parts that perform specific functions and that viruses are different from cells.
The student is expected to: describe viral reproduction.

2. If viruses aren’t alive, how do they reproduce?
QUICKWRITE!
What do you think:
If viruses aren’t alive, how do they reproduce?

3. Lytic = SHORT Lysogenic= LONG
Viral Reproduction
Lytic = SHORT
Lysogenic= LONG

4. virus that attacks a bacterium
Virus Types:
Bacteriophage –
virus that attacks a bacterium

5. Viral Attachment: Lock & Key
Before a virus can inject its genetic material into a cell, it must be able to attach to its host cell.
This attachment occurs through a lock and key mechanism.

6. Lytic Cycle – Short

7. Lytic Cycle Steps 1. Attach 2. Inject 3. Replicate 4. Assemble
5. Lyse (Release)

8. Lytic Cycle Examples: Common cold Influenza Rabies
Tobacco Mosaic Virus
Timeline of Lytic Cycle Viruses:
Host typically displays symptoms between 3 and 14 days after being infected.

9. Lysogenic Cycle – Long
Prophage – When the bacterial and viral DNA are combined

10. Lysogenic Cycle Timeline of Lysogenic Cycle Viruses:
Examples:
Herpes simplex → Herpes, Cold Sores
Varicella Zoster Virus → Shingles
Human Papilloma Virus → Warts
Human Immunodeficiency Virus (HIV) → AIDS
Timeline of Lysogenic Cycle Viruses:
Host typically doesn’t show symptoms for an extended period of time after being infected, could be months or years.