BIO 208 Lecture Notes - Lecture 21: Exocytosis, Ribosomal Rna, Osmosis
Document Summary
Jan. 25, 2016: structure, function, relationships, question of day? what allows chemicals to become alive ? or at what point should we consider them alive, the original blues brother (edgar and john winters) were albino. Cell structure and function: structure of eukaryotic cells, organelles and their function, cell membrane and permeability. The boss (the nucleus is her of ce) Messengers, foremen, and workers a. ) mrna: boss"s trusty messenger b. ) trna: foremen that translate c. ) rrna: assembly line workers. Surface lubrication receptors, recognition glycocalyx( a type of glyco-protein) The cell membrane: selectively permeable membrane: function= regulation and communication, membrane permeability. Ltration: membrane as a semi-porous sieve due to hydrostatic pressure (driving force) Diffusion (osmosis is water diffusion ) a. ) simple diffusion: passive move down gradient. Hydrostatic pressure (not diffusion): mechanical driving force pushes" (e. g. heart beat; syringe plunger) b. ) osmotic pressure. An indication of the force w/ which pure water moves thru barriers as a result of solute concentration difference.
