BIOL 101 Lecture Notes - Lecture 11: Microtubule, Aquaporin, Signal Transduction
Document Summary
All organisms are made of cells, cells are the smallest unit of life, all cells come from pre-existing cells. Light microscope (lm): visible light is passed through specimen, then through glass lenses. Lenses bend the light to magnify the image, magnify to about. Scanning electron microscopes (sems): focus a beam of electrons onto the surface of a specimen, provides a 3d look. Transmission electron microscope (tems): focus a beam of electrons through specimen, mainly used to study internal structure of cells. Magnification is the ratio of an objects image size to its real size. Resolution is the measure of the clarity of the image or minimum distance of two distinguishable points. Contrast is the visible differences in brightness between parts of a sample. Cell fractionation takes cells apart and separates the major organelles, this allows scientists to determine organelle functions and correlate cell function and structure. Prokaryotic (bacteria and archaea) and eukaryotic (plant, animal, protists, fungi)
