1. The cell theory

2. Cell theory – First part
Cell are the basic structural and functional unit of living organisms

3. Levels of organization
Cell -> Tissue -> Organ -> Organ System -> Organism

4. Levels of organization
Cell – the basic structural and functional unit of tissue
Tissue – a collection of cells of the same type that comes together to perform a function
Organ – a collection of tissues which come together to perform a function
Organ system – a collection of organs that come together to perform a function
Organism – a collection of organ systems

5. Cell theory – second part
All living things are made up of cells containing DNA and RNA and surrounded by a membrane

6. Cell theory – third part
Cells arise from other cells

7. Two types of cells Prokaryotic cells –
Always unicellular
NO nucleus
Free floating circular DNA
NO organelles except ribosomes
EX : Bacteria cells
Eukaryotic cells – two types : Plant and Animal
Unicellular or multicellular
DNA enclosed in a nucleus
Membrane bound organelles
EX : plants, animals, protists, and fungi

8. Two types of cells

9. Endosymbiotic theory
Bacteria began living inside other bacteria and over time a dependence formed which created complex eukaryotic cells

10. Evidence for the endosymbiotic theory
We see symbiosis between bacteria in modern species.
Mitochondria and Chloroplasts have their own DNA
Mitochondria and Chloroplasts have similar methods of reproduction as prokaryotic cells
Mitochondria and chloroplasts have double membranes

11. Cell Theory recap
Cells are the basic structural and functional unit of living organisms
All living things are made up of cells containing DNA and RNA and surrounded by a membrane
Cells arise from other cells