1. Literacy Transition : Viruses

2. Introduction to Viruses DQ’s
What do we already know about viruses?
Why are viruses dangerous?
What is a virus made of?

3. Discovery Education: Life Science: Viruses
Stop at: 3:10 – Given that viruses are so specialized and attack different parts of the body, what challenges do scientists have trying to treat viral disease? 6:08 – How are vaccines used to prevent viral diseases? 9:59 – How has human activity led to the increased number of viral diseases on our planet? 13:08 – Why are viruses, such as HIV able to spread so quickly throughout a population? End – Why did the viral outbreak of Ebola in Virginia turn out to be nothing more than a scare?

4. Life Science: Viruses DQ’s Post Video
What is a virus, and how does it reproduce?
How does the body fight a virus? What are antibodies?
What was Edward Jenner’s discovery, and how did it lead to the development of vaccines?
How does a vaccine work?
Who invented the polio vaccine—the first vaccine that didn’t make people sick?
How can new viruses emerge?
What viral disease affects one in 100 people between the ages of 15 and 49 and is especially prevalent in Africa?
What is one way new viruses are being monitored and controlled?

5. Bacteria devouring viruses!!!
Bacteriophages
Bacteria devouring viruses!!!

6. What is alive?

7. Create a T - Chart
Living
Non – living

8. What separates the living from the NON-living?
Bacteria & protists=LIVING
Viruses = NON-LIVING

9. Compare & contrast… LIVING THINGS…. NON-LIVING THINGS…
ABSORB & USE ENERGY
DON’T ABSORB & USE ENERGY

10. Compare & contrast… LIVING THINGS…. NON-LIVING THINGS…
DON’T ABSORB & USE ENERGY
DON’T GROW
ABSORB & USE ENERGY
GROW

11. Bacteria grow in numbers EXPONENTIALLY – called binary fission
1 to 2 to 4 to 8 to 16 to 32…..doubling their numbers in a short time.
--making perfect clones (genetic copies)
Exponential growth…

12. Viruses don’t reproduce, so they are not considered alive.
NON-LIVING THINGS…
LIVING THINGS….
DON’T ABSORB & USE ENERGY
DON’T GROW
3. DON’T REPRODUCE
ABSORB & USE ENERGY
GROW
REPRODUCE

13. But scientists (microbiologists) argue over whether viruses are living or non-living organisms.

14. How do viruses make more viruses?

15. How do viruses make more viruses?
Not like animals & plants who reproduce sexually by exchanging genetic info.
Not like bacteria or protists.
These microbes mostly divide and split asexually (fission) to make perfect clones .

16. How do viruses make more viruses?
Not by sexual or asexual reproduction.

17. Remember, viruses are really tiny. And viruses are very simple critters.
The virus is basically its genetic material (its “DNA”) surrounded by a protein coating.

18. Viruses can lie dormant for years.
Like insects?

19. But if you or any other living thing touches a virus…it injects its genetic material into your cell!
Its may be you, a bacterium, a protist, tree or another human!

20. And instead of your cell doing what it is supposed to do…
like help you breathe if a lung cell or
help you move if a muscle cell.

21. And instead of your cell doing what it is supposed to do…
YOUR CELL IS REPROGRAMMED TO BECOME A VIRUS MAKING MACHINE!
This “host” cell eventually fills up with little viruses until the cell pops and out comes more viruses ready for infection!

22. And instead of your cell doing what it is supposed to do…
YOUR CELL IS REPROGRAMMED TO BECOME A VIRUS MAKING MACHINE!
This “host” cell eventually fills up with little viruses until the cell pops and out come more viruses ready for infection!

23. And these new viruses can now spread around a body to infect other cells near it.

24. Build a Model Virus Label your capsid: Name, block,
bacteriophage in the center box.
Color your bacteriophage.
Cut out your bacteriophage.
Tape the head of your bacteriophage together.
Connect the tail (sheath) to the head and tape.
Twist the tail fibers together and tape to the tail.
That’s it!! Viruses are mainly DNA wrapped in a protein coat known as a capsid.