1. An Introduction to
Viruses

3. The Definition
An infective agent that typically consists
of a nucleic acid molecule in a protein
coat, is too small to be seen by light
microscopy, and is able to multiply only
within the living cells of a host

5. The Definition
An infective agent that typically consists
of a nucleic acid molecule in a protein
coat, is too small to be seen by light
microscopy, and is able to multiply only
within the living cells of a host

7. Let's see this in action!

8. Let’s Recap
1. An infector
2. No cells but has DNA protected by a
shield of proteins
3. Cannot reproduce on its own-
needs a host
4. Really, really, really small

9. So how
small
are
these
things?

16. Five Traits of Life
1. Be made of 1 or more cells
2. Have a metabolism
3. Grow, develop, & evolve
4. Reproduce
5. Respond to stimuli

19. No matter if you think viruses
are alive or not, we need to
protect ourselves

20. Two Options