1. Levels of organization Subatomic particles –electrons outside nucleus negative charge small mass –protons in nucleus positive charge –neutrons in nucleus no charge Atom(one element) Molecule (multiple atoms) Macromolecules(polymers made of monomers) –proteins made of amino acids –nucleic acids made of nucleotides –lipids made of glycerol and fatty acids –carbohydrrates made of sugars

2. Levels of organization continued Organelles (specific function “parts of cell”) Cell (functional unit of life) –plasma membrane –cytosol + organelles = cytoplasm tissues (cells of one type working together) organs multiple types of tissues working together organ system - multiple organs with common theme

3. Level of organization continued Organism “a living thing” bacterium to human population all the members of one species in a specific area “pack of wolves” community all the organisms within a specific area (many species) ecosystem all the biotic and abiotic components of a small area “pond ecosystem”

4. Levels of organization continued Biomes - general areas with uniform plant life due to levels of precipitation and temperatures. Biosphere- The life supporting portion of the earth. –Biosphere II self contained building to make a mini earth in a bubble. –GAIA- Earth is like an organism with homeostatic control “James Lovelock”

5. Review questions What is the hypothesis that treats the Earth as an organism? What level of organization would a puddle in you driveway be? What level is the tundra? What level is a colony of ants? What level is an enzyme? What level is a finger? What level is oxygen gas? What two parts of an atom are in the nucleus?