BIOL 21 Lecture Notes - Lecture 10: Optical Microscope, Protozoa, Organelle
7 Apr 2017
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Overview: fundamental units of life: all organisms = made of cells, cell = simplest matter that can live, structure and function = correlated, all cells = related. Surface area to volume ratio: cell size = limited. Get nutrients from environment through cell membranes: sa , volume , volume increases faster than sa, small cell = raw materials diffuse to all areas of the cell. Why is microscopy important: use microscopes to see cells. What"s a light microscope (lm): light microscope: shoots light/photons at a specimen. Makes the image bigger (used during cell lab) Benefits of the lm: can see living tissues, used to see bigger cell structures (ex) nucleus and chloroplasts. Limitations of the lm: some cell structures = too small for lm"s to see. What are electron microscopes: ems: microscopes that shoot electrons at specimens. Specimens covered in gold (so electrons can bounce off)
