Biology 1201A Study Guide - Midterm Guide: Keratin, Autophagy, Gamete

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The cell: first person to coin the word "cell" to describe the tiniest components of living systems - plants! Resolution limit of light microscope is about 0. 2 microns (size of a small bacterium remember 1 micron is . 001mm) In 1950"s the introduction of the electron microscope enabled organelles, viruses, proteins, etc to be imaged. The minimum resolution of a light microscope is about . 2 microns, the size of a small bacterium. Light microscopes can magnify effectively to about 1,000 times the size of the actual specimen. Take cells apart to study their components. Centrifuge is used to fractionate cells and separate their major organelles. Ultracentrifuges are capable of speeds as fast as 150,000 rpm applying forces over 1 million times the force of gravity. Cell = simplest collection of matter which has all the properties of life: lowesthierarchicallevelwhichis alive, cellisbasicunitoflife, cell performs all functions necessary to live and reproduce. Occur in virtually every kind of organism.

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