Biology 1002B Chapter Notes - Chapter 2: Nuclear Pore, Nuclear Membrane, Nuclear Localization Sequence
Document Summary
Cell theory: all organisms are made of 1 or more cells, cell is the basic functional unit of organisms, cells only arise from pre-existing cells. 2. 1 - basic features of cell structure and function. Uses chemical molecules / light as energy. Respond to changes by altering enteral reactions. All these processes are invisible to naked eye. Unicellular organisms: ex: bacteria, archaea, some protists/ fungi. , each cell can be functioned as an independent organism, that single cell is capable of carrying out all necessary activities. Multicellular organisms: ex: plants & animals, activities of life are divided among different specialized cells, each individual cell is potentially capable off surviving on its own, if placed in a suitable chemical medium. Life does not exist in any simpler form than cells- if we cut a cell open, it loses all its functions. Cells are small & cn only be seen using a microscope. Life is in 3 domains: bacteria, archaea, eukarya.