Bio 201 F09 True lect 12 (L12)v2r

Bio 201 F09 True lect 12 (L12)v2r - Todaysfactoid...

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Today’s factoid ‘Biological Par4cles at High Al4tudes’ posted in Biology in the News on BB atmospheric scien4sts have recently found that the solid par4cles around which clouds and atmospheric include many biological par4cles such as plant ma±er, spores of fungi, or bacteria these par4cles travel many thousands of miles, essen4ally around the world research based in part on flights in clouds over Wyoming http://www.wrh.noaa.gov/vef/monsoon/image005.jpg
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Chloroplasts ‐ mul4ple origins The key clue is the number of membranes surrounding the chloroplast 2 = primary ± = secondary Some lineages have undergone two diFerent events; have two types of chloroplasts (ter4ary, quaternary may have also occurred) Only glaudophytes retained pep4doglycan
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Endosymbio4c theory Mitochondria evolved from ancient bacteria Chloroplasts evolved from ancient photosynthe4c bacteria or photosynthe4c eukaryotes Originated by Konstan4n Mereschkowski in 1905 Revived and inves4gated by Lynn Margulis in the 1960s‐1970s Was once thought to be a strange idea Ini4al evidence was structural DNA evidence sealed it h±p://en.wikipedia.org/wiki/Image:Merezhkovsky_K_S.jpg h±p://en.wikipedia.org/wiki/Image:Lynn_Margulis.jpg
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cytoskeleton • Important for: – Mo4lity • Pseudopodia, cilia, flagella – Chromosome movement during mitosis and meiosis hAp://Fg.cox.miami.edu/~cmallery/150/life/meiosis.pics.jpg hAp://porpax.bio.miami.edu/~cmallery/255/255hist/mcb1.15.cytoskeleton.jpg
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Bacterial vs. Eukarote flagella • Bacterial flagellum – Single “fbril” composed oF flagellin (protein) – Hook and basal body drive mo4on • Eukaryote flagellum – Independently evolved – Enclosed by plasma membrane – 9 pairs oF microtubules surround 2 microtubules in the center hAp://en.wikipedia.org/wiki/Image:±lagellum_base_diagram.svg hAp://fg.cox.miami.edu/±aculty/Dana/flagellum.jpg
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This note was uploaded on 12/22/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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Bio 201 F09 True lect 12 (L12)v2r - Todaysfactoid...

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