1. Viruses
February

2. Learning Objectives
Identify the structures of bacteriophages and retroviruses
Describe the life cycle of (1) lytic and (2) lysogenic viruses.
Describe the body’s defense mechanisms against a viral/bacterial infection

3. Structure Replication Prevention
What is a Virus?
Let’s draw a virus!
Structure Replication Prevention

4. Structure Replication Prevention
What is a Virus?
Membranous
Envelope
Antigen
RNA
Bacteriophage
Retrovirus
Structure Replication Prevention

5. What is a virus Antigens are like the face of a virus
Once recognized, the body can create antibodies that target it
They can be glycoproteins, toxins or anything on the surface of the vius

6. Structure Replication Prevention
In bacteria and eukaryotic cells, ribosomes are used to make proteins.
Structure Replication Prevention

7. So how does it grow or reproduce?
Viruses have no ribosomes to make proteins.
So how does it grow or reproduce?
Structure Replication Prevention

8. Structure Replication Prevention
Viruses cannot reproduce on their own.
They must take control of another cell with ribosomes to do the work for them.
Structure Replication Prevention

9. Structure Replication Prevention
Lytic Cycle
When the virus injects its DNA into the host cell.
The host cell then begins producing viruses that then burst from the cell.
Structure Replication Prevention

10. Structure Replication Prevention

11. Structure Replication Prevention
Lysogenic Cycle
When the virus injects its DNA into the host cell.
The host cell then begins producing viruses that then burst from the cell.
Structure Replication Prevention

12. Structure Replication Prevention

13. Structure Replication Prevention
Primary Line of Defense
Skin
Oil and Sweat
Hairs and cilia in mouth and nose
Stomach (acids)
Saliva, sweat and tears (lysozyme)
Structure Replication Prevention

14. Structure Replication Prevention
Secondary Line of Defense
Inflammatory response: white blood cells
Fever
Structure Replication Prevention

15. Structure Replication Prevention
Tertiary Line of Defence
Interferons : produced by cells to interfere with virus replication
Antibody production: white blood cells produce antibodies
Structure Replication Prevention

16. Teigen, Alexander, Logan
Group 1
Ana, Alison, Brenda
Group 2
Ryan, Jacob, Lexus
Group 3
Aiden, Alexis, Adel
Group 4
Allison, Katie, Cassidy
Group 5
Megan, Julia, Alaiah
Group 6
Teigen, Alexander, Logan

17. Group 1
Kiyano, Cassy, Kyle G.
Dylan, Maya
Group 2
Aliyah, Jake, Megan D.
Narmin, Meaghan
Group 3
Alex, Nathan, Riley
Josie, Ryan
Group 4
Shereen, Sydney, Denisa
Erik, Kaitlyn
Group 5
Anton, Kanta, Sierra
Michelle, Pavel
Group 6
Noah, Paisley, Brittney
Kyle R., Princess