1. Cells Part III Cells III

2. Cell Theory 1. The cell is the smallest unit of life. 2. All organisms are made from one or more cells. 3. Cells arise from pre-existing cells. Schleiden & Schwann

3. All cells have:  Cell membrane  Surrounds, contains, protects  Cytoplasm  “Cell gel” fills interior of cell  Ribosomes  Help make proteins for cells  DNA  Contains instructions for cell

4. As you study cell parts:  What does it look like?  What is its function?  What other organelles does it work with?  How does the structure of this organelle allow it to do its job?  Is it in animals? Plants? Both?

5. Animal Cell

6. Plant Cells

7. Plant Cell

8. Plants have specialized organelles not found in animal cells:  Rigid cell wall: support  Chloroplasts: capture energy from sun  Large vacuole: storage (water, sugars)

9. Chloroplast: Use sunlight to make sugars Photosynthesis

10. Chloroplasts

11. Plant Cell Vacuole: Stores water and food

12. Plant Cell Walls: Support and Protection

13. A few examples of specialized cells from complex organisms

14. Elodea (400 X) - photosynthesize

15. Dividing Onion Root Tip with DNA visible as cluster

16. Neuron

17. Heart muscle cells beat > 5 billion times in a lifetime!

18. Egg cell surrounded by sperm

19. 2-cell embryo - first division after fertilization (This one will become a sea urchin)

20. Red Blood Cell: specialized to transport oxygen to other cells

21. White Blood Cell: Protects the body from Invaders

22. Great sites for cell biology:  www.cellsalive.com www.cellsalive.com  http://learn.genetics.utah.edu/content/be gin/cells/ http://learn.genetics.utah.edu/content/be gin/cells/