1. Microorganisms – Protists, Bacteria and Viruses

2. Protists
Protists are eukaryotic – Which means they are cells with a nucleus.
They can be unicellular or multicellular
They can be animal-like, fungus-like or plant-like.

3. Some protists:
amoeba
amoeba ingesting a paramecium

4. Giardiasis
Giardia
cyst
trophozoite

5. Bacteria
Bacteria are prokaryotic cells. This means, they do NOT contain a nucleus.
They have a Cell Wall and a Cell Membrane.
Their genetic material (DNA) simply floats around in the cytoplasm.
Many have flagella for locomotion.

6. The structure of a bacterium
e-class on bacteria

7. Spherical Bacteria - Cocci

9. Rod-Shaped Bacteria – Bacilli (eg. E-coli)

10. Spirial Shaped Bacteria - Spirilla

11. Viruses
Viruses are not living organisms. Without a host cell, viruses cannot carry out their life-sustaining functions or reproduce. They cannot synthesize proteins, because they lack ribosomes. They must use the ribosomes of their host cells. Viruses cannot generate or store energy because they lack mitochondria. They have to derive their energy from the host cell. They also parasitize the cell for basic building materials, such as amino acids, nucleotides, and lipids (fats).

12. Viruses have a “protein coat” with RNA or DNA on the inside
Viruses have a “protein coat” with RNA or DNA on the inside. No other organelles.

13. 1 Adsorption
2 Penetration
3 Early Replication
4 Late Replication
5 Maturation
6 Release