1. Levels of Biological Organization

2. Levels of Organization
1. Atoms
C, H, O, N, P, S etc.

3. Levels of Organization
2. Chemical Building Blocks
Amino Acids, Nucleotides, monosaccharides, fatty acids

4. Levels of Organization
3. Macromolecules
DNA, Proteins etc.

5. Levels of Organization
4. Organelles
Mitochondrion, etc m

6. Levels of Organization
5. Cells
Heart muscle cells

7. Levels of Organization
6. Tissue
Cardiac Muscle

8. Levels of Organization
Heart

9. Levels of Organization
8. Organ System
Circulatory System

10. Levels of Organization
9. Individual

11. Levels of Organization
10. Population

12. Cell Scale!

13. ~ALL ABOUT CELLS~

14. It has been estimated that there are 10 times more cells in the human body than stars in the Milky Way.

15. "I'm sorry, Mr. Johnson, but my stem cell research funding has been cut. I'm afraid you'll never walk again."

16. Cell Theory All living things are composed of cells.
Cells are the basic units of living organisms
All cells come from pre-existing cells.

17. Cell Theory The Human body is estimated to have 100 trillion cells.
Different cells are specialized to perform various tasks.
Examples:
Nerve Cells transmit electrochemical messages.
Muscle Cells contract.
All cells:
Digest nutrients
Excrete wastes
Synthesize needed chemicals
Reproduce

18. All cells are either Prokaryotic or Eukaryotic (p. 41)

20. Prokaryotic Cells No internal compartments No organelles
All prokaryotes are
1-celled organisms
Eg. bacteria

21. Prokaryotic Cells Quite small (compared to eukaryotes)
DNA located in nucleoid region
May not need O2

22. Eukaryotic Cells Have internal compartments Have organelles
1-celled or multi-celled organisms
Eg. A plant cell

23. Eukaryotic Cells Larger cells DNA located in the nucleus
Usually need O2