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Biology 2200 Exam 2 Questions and Verified Answers | Passed | A+
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Define biodiversity : the variability among living organisms, within and among species and ecosystems How many species have been described? how many are estimated to be on earth? : described = 1.6 million estimated = 2 million to 1 trillion (mostly due to 1-5 billion microbes) What do bacteria and archaea use for their cell wall? : bacteria - peptidoglycan archaea - protein and polysaccharides What are fimbrae (pili)? : Short appendages that promote adherence (allow the bacteria to stick to cells) 2 ---also used for conjugation What is a capsule? : thick viscous slime layer What is flagella? : whip like tail What do aerobic prokaryotes have? : respiratory membran
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