BILD 1 Chapter 7: Chapter 6
18 Dec 2018
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All organisms are made of cells simplest collection of matter that can be considered a living entity. Multicellular: plants and animals specialized cells that cannot survive on their own. All cells are related by descent from earlier cells share common features. 6. 1 biologists use microscopes and biochemistry to study cells. Robert hooke first saw cell walls of bark of a dead oak tree. Light microscope (lm): visible light is passed through specimen is magnified as projected into eyes or camera. Labeling indi molecules with fluorescent markers have made it possible to see structures with increasing detail. Sharper images of three dimensional tissues and cells. Magnification: ratio of object"s image size to its real size. Lm can magnify effectively to about 1000 times actual size of specimen. Resolution: measure of clarity of image minimum distance two points can be separated and still be distinguished as separate points. Contrast: difference in brightness between light and dark areas of image.
