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?