BLG 151 Study Guide - Final Guide: Antiporter, Endospore, Nucleoid

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28 Sep 2015
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The bacterial cell: shapes, the shapes are mostly cocci and rods, there are other shapes as well, arrangement, determined by plane of division, determined by separation or not, size, varies. Cocci (s. , coccus) spheres: diplococci (s. , diplococcus) pairs, streptococci chains, staphylococci grape like clusters, tetrads 4 cocci in a square, sarcinae a cubic configuration of 8 cocci, bacilli arrangements (s. , bacillus) rods, coccobacilli very short rods, vibrois resemble rods, comma shaped, spirilla (s. , spirillum) rigid helices, spirochetes flexible helices. Plasma membrane functions: encompasses the cytoplasm, selectively permeable barrier, interacts with external environments, receptors for detection and response to chemical surroundings, transport systems (waste and nutrients, metabolic processes. Integral: amphipathic and embedded within the membrane, carry out important functions, may exist in microdomains, bacterial lipids, saturation of membrane lipids reflect the environmental conditions such as the, bacterial membranes lack sterols but do contain sterol like molecules, hopanoids temperature.