2. Unit 2: What is a Cell?

3. Cells are: different shapes and sizes

4. Cell Theory 1.All Living things are made of one or more cells. 2.All cells come from pre-existing cells –Cell reproduce Asexual reproduction Sexual reproduction 3.All cells carry out life’s activities –Exchanging O2 and CO2, –Producing proteins – replacing dying/dead cells

5. Scientists and Cell Theory Pasteur- Redi - Hooke - Brown - Schwann- Schlieden- Virchow- Van Leewuenhoek- In your Groups!

6. All cells are characterized as either: A prokaryote (prokaryotic) Or A Eukaryote (Eukaryotic) KNOW THESE TERMS!!

7. A Prokaryotic Cell: Have genetic material that is NOT contained in a nucleus Genetic material is “floating” in the cytoplasm Usually smaller than eukaryotic cells Considered the earliest cells No membrane bound organelles: nucleus, chloroplast, or mitochondria

8. A eukaryotic cell: Genetic material is contained within the NUCLEUS Genetic material is separated form the rest of the cell Can be unicellular or Multicellular

9. Cells can be: Unicellular – only 1 cell large Ex’s bacteria, ameba’s, paramecia

10. Cells can be Multicellular – made of many cells Can be simple organisms or complex Ex. Hydras and humans

11. Parts of Cells Cells contain many internal structures called organelles Each organelle performs a specific function vital to life Letters A-Q represent cell organelles

12. Cell Organelles : Microscopic structures that make up the cell Each organelle performs a specific function for the cell Ex of organelles: –nucleus –Mitochondria –Chloroplasts –Golgi bodies

13. Differences b/w plant and animal Cell 1.Vacuole: Plants have 1 large vacuole Animal cells have multiple smaller vaculores 2.Chloroplasts are plants only!!! (photosynthesis) 3.Cell Wall found in plant cells only!! 4.Centrioles found in animal cells only!!! 5.Shape: boxy shapes = plant rounded = animal

14. Plants vs. Animal Cells: PlantAnimal 1.Boxy shaperoundish shape 2.Chloroplastsnone 3.NoneCentrioles 4.Cell wallnone 5.1 large Vacuolemany small vacuoles