1. Set up Cornell notes in your IAN Notebooks to take notes on
Viruses!!!

2. Answer the questions to this video as you watch!
How does a virus attack?
Answer the questions to this video as you watch!

3. Flu Attacks! Video Questions
Complete the Flu Attacks! Video Worksheet with questions and a critical writing paragraph.
Submit the finished worksheet in the Canvas Assignment

4. Characteristics of a Virus
Not cells
Non-living (can’t be treated with antibiotics)
Change over time
Very small
Cause diseases – pathogen

5. Viruses DO NOT Grow (can’t get bigger) Metabolize nutrients (eat)
Have a nucleus
Have organelles
Respond to stimuli
Reproduce without a host - parasitic

6. Viruses are made of A protein coat called capsid
DNA or RNA – but never both

7. Viruses also have
Antigens – Glycoproteins on the capsid to recognize a target cell and bind to the receptor (fits like a key and lock)

8. Vaccines Inject a weakened virus
Helps stimulate immune system to create antibodies against the virus
Creates resistance to the virus
Antibodies – proteins that attach to antigens keeping the immune system strong

9. A RETROVirus is A virus with RNA as its genetic material
The RNA mutates easily by transcribing RNA backward
Each individual virus created can be slightly different from the others (so hard for immune system to keep up with changes)

10. DRAW & LABEL the VIRUS below
Bacteriophage
(infects bacteria)
Nucleic Acid Core
CAPSID – made of a protein coat
Antigen/Glycoprotein

11. Bacteriophage

12. DRAW & LABEL the VIRUS below
HIV
(Retrovirus RNA)
Nucleic Acid Core (RNA)
CAPSID – made of a protein coat
Antigen
(glycoprotein)
Membrane Envelope (Made of lipids & glycoproteins)

13. HIV Virus

14. DRAW & LABEL the VIRUS below
Influenza
(Flu – Retrovirus RNA)
Nucleic Acid Core
CAPSID – made of a protein coat
Antigen
(glycoprotein)
Membrane Envelope (Made of lipids & glycoproteins)

15. Influenza Virus

16. Viruses have a protein coat and genetic material.

17. How come we can not get the Tobacco Mosaic Virus?
Viruses can only infect the host that they are intended for.
The proteins on the surface of the virus fit the proteins on the surface of a host cell like this key fits this lock.

18. LYTIC CYCLE

19. Active Viruses Enter cell. Take over cell functions.
Produces more viruses.
Cell bursts releasing lots of new viruses.
Those viruses infect more cells.
The LYTIC CYCLE is SHORT! You can get the virus today, and be infected by tomorrow!

20. LYSOGENIC CYCLE

21. Hidden Viruses
Enter cell.
The Viruses genetic material becomes part of the cell genetic material. (It Hides!)
The Virus is dormant for a long time.
SUDDENLY, the dormant virus becomes active! It produces more viruses.
Cell bursts releasing lots of new viruses.
Those viruses infect more cells.
The LYSOGENIC CYCLE is LONG! You can get the virus today, but not get sick for months or years!

22. between an active and hidden
What is the difference
between an active and hidden
virus?
The genetic material of a hidden virus can “hide” inside of the cell.
It is undetected or hidden so the cell can not attack the virus!
You can NEVER get rid of a hidden virus…EVER.