1. Prokaryotes vs. Eukaryotes
Microbiology –Unit 3
Prokaryotes vs. Eukaryotes

2. Introduction - Cells All living organisms have cells
Basic unit of structure
Large organisms – many cells
Cells are organized into:
Tissues
Organs
Systems

4. Classification of Organisms
Eukaryotes - All multicellular organisms and unicellular organisms (except 2)
Examples: mammals, fish, plants, fungi, algae and protozoa
- Prokaryotes - Only bacteria and cyanobacteria

6. Definitions
-Prokaryote: - Simple cell - No nucleus - No organelles - Only cell membrane

7. .

8. Definitions
Eukaryote: - Complex cell - Has a nucleus - Has organelles - Has cell membrane

10. Prokaryotes - Very Small Cells
- Cell wall – gives shape and protection
- Cell membrane - lines cell wall and regulates molecular traffic
- Nucleoid region – Area where single strand of DNA is – not membrane bound

11. Prokaryotes - Very Small Cells
-Cytoplasm – Contains a soup of chemicals, plus ribosomes - All cell activities occur here -Flagella – Not all bacteria have them – If they do it is a single strand of protein

12. Eukaryotes –Larger Cells
- Cell Wall (if present) – gives shape and protection
- Cell Membrane – lines the cell wall and regulates molecular traffic
- Nucleus – contains double stranded DNA organized into chromosomes, and RNA, all within a nuclear membrane

14. Eukaryotes –Larger Cells
Cytoplasm - soup of chemicals for all cell activities, that contains membrane-bound organelles
- Flagella – If present, it is a more complex, cable-like arrangement of protein strands
Euglena