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Bio 201 F11 Lect 12 (True) v2r

Bio 201 F11 Lect 12 (True) v2r -...

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Biology in the News [see folder on BB] Near a small village in southern China, about 3000 newly discovered fossils are revealing many new insights from a 600 million year old community of seaweeds and worm‐like metazoans the LanCan formaCon this is a black shale formaCon, a rock type known to be able to preserve fossils very well Thus far, 15 new species have been idenCfied This is some of the earliest informaCon about life aIer the "snowball earth" age ended about 635 million years ago (mya) geological evidence indicates an oxygen rich local environment, even though the oceans were largely oxygen‐free at that Cme ‐ suggesCng that the oxygen content of the oceans has varied throughout evoluConary Cme since cyanobacteria first oxygenated the oceans 2‐4 billion years ago "brief oxic episodes" have been proposed to account for the unusual diversity of the fossil community at this site/Cme a return of anoxic condiCons would then have exCnguished this life hQp://www.nsf.gov/news/news_summ.jsp? cntn_id=118598&WT.mc_id=USNSF_51&WT. mc_ev=click
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be quiet in class part of SBU Student Code of Conduct see bio 201 syllabus statement students who are warned and ignore warning will receive 0 on next mid term exam
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note that this does not reflect a revision of scores the week of 10-3; please see BB for final distribution and scores
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RelaConships of major Prokaryote groups see LIFE 9 th ed Fig. 26.11
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Major Prokaryote groups Spirochetes Gram negaCve chemoheterotrophs move using axial filaments (see prev. lect) includes parasites: syphilis pathogen, Lyme disease pathogen ( Borrelia) Treponema pallidum , the syphilis pathogen
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Major Prokaryote groups Chlamydias smallest bacteria (0.2‐1.5 µm dia.) on average Gram negaCve cocci with complex life cycle Obligate parasites (apparently cannot produce much ATP by themselves) Various infecCon types in humans, incl. STD
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Obligate versus facultaCve Obligate indicates an organism must do some thing e.g. Chlamydias are obligate pathogens FacultaCve means an organism can do one thing in one situaCon and another thing in a different situaCon e.g. many bacteria that grow as symbionts in animal guts can also grow in isolaCon in the laboratory (symbiosis means a close, long‐term associaCon; parCcipants in a symbiosis are called “symbionts”)
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list of recognized human symbiont “flora” hQp://en.wikipedia.org/wiki/List_of_human_flora Binomial name Location Binomial name Location Achromobacter spp Large intestine, small intestine (Ileon) Fusobacterium nucleatum Mouth Acidaminococcus fermentans Large intestine Gordonia Bacterium spp Sputum Acinetobacter cacoaceticus Large intestine Haemophilius parainfluenzae Mouth Actinomyces spp Amygdala Haemophilus paraphrophilus Mouth Actinomyces viscosus Mouth Lactobacillus spp Mouth, Saliva Actinomyces naeslundii Mouth Leptotrichia buccalis Mouth Aeromonas spp Large intestine, small intestine (Ileon) Morganella morganii Feces
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