BSCI 105 Chapter Notes -Anabolism, Exergonic Reaction, Metabolic Pathway
Document Summary
Active transport- the need for energy to transport molecules against concentration gradient. Diffusion- high concentration to low concentration, continuous until reach equilibrium. Determined by molecule diameter, solution temp, electrical charge of diffusing material, [] gradient. Receptor mediated endocytosis (ligand binds to clathrin coated pits (protein)), bring cholesterol into cell. Exocytosis- vacuole of matter leaving cell through plasma membrane, secretes hormones and neurotransmitters. Facilitated diffusion- when channel protein (surrounds aqueous pore)or carrier protein (undergoes conformational change, specific) passively used to transport molecules, Animal cells- burst in hypotonic, limp at hypertonic, isotonic. Plant cells- turgid in hypotonic, shrivel at hypertonic, isotonic. Osmosis- diffusion of water (only water moves from low to high concentration) Cotransport- indirect use of energy (1 mol moves down [] gradient, to move another against its gradient= Uniport (1 mol 1 dir)/ antiport (2 mol dif dir)/ symport (2 mol same dir) First law- energy cannot be created or destroyed (conservation of energy)