BSC 118 Lecture 6: BSC 118 Chapter 6
22 Nov 2016
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Historical perspective: theodor schwann (1810-1882), matthias schleiden (1804-1881), and rudolf. Virchow (1821-1902) are generally credited for developing the basic concepts of cell theory (now accepted as fact), which states the following: All living things are composed of one or more cells. Cells are the basic units of structure and function in living things the cell is the simplest collection of matter capable of performing all the activities of life. Magnification the ratio of a(cid:374) o(cid:271)je(cid:272)t"s i(cid:373)age size to its a(cid:272)tual size. Resolution measure of the clarity of an image (the minimum distance two points can be separated and still be distinguished as two points) Contrast the degree of difference between the lightest and darkest parts of a sample. Prokaryotes bacteria and archaea: no membrane-bound organelles, dna: Usually located in a non-membrane bound region called the nucleoid: cytoplasm is bound only by a plasma membrane. Eukaryotic cells: have membrane-bound organelles, generally much larger than prokaryotic cells, dna:
