BIOL240 Lecture 5: BIOL 240 - Class 5 Fall 2017
15 Mar 2019
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Document Summary
Live in aquatic environments (spirillium or spirilla) like treponema pallidum: pleiomorphic which are varied shapes; not classified. Cell morphology can be determined by selective forces: nutrient uptake efficiency (sa/v ratio, gliding motility, spirals allow efficient swimming in viscous or turbulent fluids (i. e. near surfaces) Cyanobacteria grow in a colony by linking up side by side one cell thick. They make this branch or chain of cells called trichomes. Prokaryote size: 0. 2microm to 700microm, eukaryote: 10microm to 200microm. Minimum size simply due to minimum space requirements for genome, proteins, ribosomes. Thiomargarita namibiensis (thiomargarita is latin for sulfur pearls, found in sediment) up to. Another is epulopiscium fishelsoni, live in surgeon fish gut. Why does it help bacteria to be small: higher sa/v ratio so, greater rate of exchange of waste and nutrients, supports higher metabolic rate, supports faster growth and faster evolution, fewer mass transport complications.
