BIO 2137 Lecture Notes - Lecture 3: Psychrophile, Decomposer, Plant Virus
12 Jan 2018
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Document Summary
Earth: most dominant and successful forms of life. Why: they are fast growing and mutate rapidly, binary fission exponential growth, they possess great metabolic diversity, many ways they can get their food and grow. Comes in several shapes: cocci (cid:862)(cid:271)err(cid:455)(cid:863), (cid:863)rou(cid:374)d(cid:863, bacilli (cid:862)rod(cid:863, spirochetes -> coil, bristle hair. Prokaryotic size: most are unicellular and very small, some prokaryotes, form true colonies, show specialization of cells, are very large. Cruising prokaryotes: about of all prok. Are motile using flagella: rotary engine powered by a proton motive force across the bacterial cell membrane. The ecological impact of prokaryotes: prokaryotes, have a major impact on the earth and its inhabitants, pathogens, are bacteria and other microorganisms that cause disease. Bacterial diseases in humans: l(cid:455)(cid:373)e"s, syphilis, leprosy. Bacterial diseases in plants: parasites (tumor growing bacteria, by inserting plasmids into the genome) Prokaryotes and chemical recycling: prokaryotes play essential roles, in chemical cycles in the enviro, in the breakdown of organic wastes and dead organisms.
