BISC 102 Lecture Notes - Lecture 4: Scanning Electron Microscope, Electron Microscope, List Of Knot Terminology
Document Summary
Schleiden and schwan who used their observations (under microscopes) to develop three principals of cells called the cell theory: all organisms are made of cells. Micro organisms are things that you cannot see without the aid of a microscope. Several types of microscopes: transmission electron microscope (hormones, chemical signals, organelles, small stuff, etc. ): you see internal structures: scanning electron microscope: looks for external structures of a cell (sees only the outside, cells are made from pre-existing cells. Smaller cells have more surface area relative to their volume. High surface area allows the cell to quickly exchange materials with its surroundings. Cytoplasm: different cell types characterize life"s three domains. The lack a nucleus (hence prokary, means before nucleus). Eukaryotes: have cells with a nucleus and other membranous organelles: the anatomy of a bacterium prokaryotic cytoplasm. Capsule (some but not most: anatomy of an animal cell. Plant cells are also eukaryotic, but notice the cell wall and chloroplasts.
