BIOL240 Lecture 2: Biol240- Chapter 2
4 Nov 2017
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Pleomorphic (variable shapes, do not exhibit regular shapes) Not a good predictor of physiology, ecology, or phylogeny. Spirals allow e cient swimming in vicious or turbulent uids (near surfaces) Bacteria can assume multicellular organizations as result of cellular division. Mycelia (tufts of hyphae, hype an form 3-d networks called mycelia) Trichomes (smooth, unbranched chains of cells, polysaccharide sheath coating the entire lament) Prokaryotes 0. 2 m to >700 m in diameter. Eukaryotic cells range from 10 m to > 200 m. Minimum size simply due to minimum space requirements for genome, proteins, ribosomes. These are exceptions to general size of bacterial cells. Thiomargarita namibiensis -> up to 700 m in diameter. Greater rate of nutrient/waste exchange per unit volume. Avoid being eaten by smaller protists, don"t fall prey. Nitrate in middle, sulphide does oxidation reaction. Size reduction constrained by min. complement of cellular structures. Very small cells common in open marine environments.
