BIOL 1202 Chapter : BIOL 1202 Chapter 27 Notes
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Biol 1202 chapter 27 notes: bacteria and archaea. The organisms that make up the two prokaryotic domains (bacteria and archaea) were the first organisms to arise on earth (about 3. 5 billion years ago). Some general characteristics: unicellular (but grow in colonies, no membrane-bound organelles, circular chromosomes. Most prokaryotes range in size from 0. 2-0. 5 micrometers in diameter. Micrometer: 1/1,000,000 of a meter: the thickness of a dime is about 1 millimeter (1000 micrometers). The two domains appear similar in many respects however they are different in some very basic ways. Danish physician): gives characteristic shapes: (these are some shapes but there are many variations of these basic shapes, bacilli: rod-shaped, cocci: spherical, spirilla: spiral. Domain archaea has a much wider variety of shapes than bacteria. About half of the prokaryotic species are capable of motion using rotating flagella: flagella (singular flagellum): found in both bacteria and archaea; are long cellular appendages specialized for locomotion.
