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Bio 201 S10 Lect 6 (True) v2r

Bio 201 S10 Lect 6 (True) v2r - reminder...

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reminder the extra credit assignment can be turned in any 2me during the semester but the last possible 2me we will accept it is 5PM the last day of class (Fri. May 7) We would appreciate it if you could turn it in well before this 2me so that we are not swamped with papers at the end.
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today’s factoid The importance of underground life to Earth's ecosystem is the theme of NSF funded research by Dr. Diana Wall at Colorado State University Nematode worm species were found to be very abundant (89 different species in 90 cubic cen2meters of soil from a tropical forest on Cameroon) were the predominant animals found in most soil environments Soil and sediment are cri2cal for agriculture human health fisheries and aquaculture erosion control waste and water processing Used both tradi2onal whole animal iden2fica2on (microscopy) and DNA based iden2fica2on of biodiversity Rapid changes in species composi2on are found in Alaska, probably due to climate change hUp://www.nsf.gov/discoveries/disc_summ.jsp? cntn_id=115253&govDel=USNSF_51; see "Underground Life" story posted in Biology in the News on Blackboard From a different study of fungi and nematodes: hUp://fungalgenomes.org/blog/2007/11/this‐fungus‐will‐trap‐you‐if‐ you‐are‐a‐nematode/
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Bacterial vs. Eukarote flagella Bacterial flagellum Single “fibril” composed of flagellin (protein) Hook and basal body drive mo2on Eukaryote flagellum Independently evolved Enclosed by plasma membrane 9 pairs of microtubules surround 2 microtubules in the center hUp://en.wikipedia.org/wiki/Image:Flagellum_base_diagram.svg hUp://fig.cox.miami.edu/Faculty/Dana/flagellum.jpg
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a brief review Diploid and haploid Mitosis: diploid parental cell duplicates its DNA (chromosome(s)) and divides once to yield two iden2cal daughter cells Haploid cells can also duplicate via mitosis Meiosis: diploid parental cell duplicates its DNA (chromosome(s)) and then goes through two divisions to yield four non‐iden2cal haploid progeny cells (gametes)
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  • Spring '08
  • TRUE
  • Chromalveolates  Plantae  Excavates  Rhizaria  Unikonts, Plantae  Excavates  Rhizaria, Excavates  Rhizaria  Unikonts

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