Bio 201 F11 Lect 11 (True) v2r

Bio 201 F11 Lect 11 (True) v2r -...

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Biology in the News [see folder on BB] in the Western US, Lyme disease (caused by the bacteria Borrelia burgdorferi ) is primarily carried by the Western black legged Bck ( Ixodes pacificus ) whose main vertebrate host is the Western fence lizard ( Sceloporus occidentalis ) It was previously known that S. occidentalis produces a protein in its blood that is toxic to Borrelia and has the effect of "cleansing" Bcks of the disease It was predicted that if lizards were removed from an area, the incidence of infected Bcks would go up because more of them would feed on alternaBve hosts that do not express the toxin However, in an experiment which cleared lizards from 14 plots of 10,000 sq. meters each and marked them to make sure they did not return, the opposite result was found; the incidence of infected Bcks went down It was found that more Bcks in the experimental plots had moved over to alternaBve hosts such as female woodrats But it was also found that 95% of the Bcks that would have infested the lizards did not go onto another host, which appears to be the explanaBon of the unexpected result i.e. the ecology of Lyme disease in this area turned out to be more complicated than expected hSp://www.nsf.gov/news/news_summ.jsp? org=NSF&cntn_id=118655&preview=false
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1 st mid term exam Wed. September 28 th in class covers material through Friday 9/23 lecture (first 10 lectures) pracBce quesBons will be posted; review sessions listed on next slide Be on Bme >10 min late will not be allowed into room Bring only your ID and pencils All other materials have to be led on periphery of the room 35 mulBple choice quesBons + 3 bonus bio news quesBons lowest of the three mid terms is dropped, avg. of other 2 = 60% of your grade Only documented medical/family/accident excuses accepted we need to be NOTIFIED before end of the day on the day of the exam
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Exam 1 Review Sessions held in Life Sciences 026 Monday 9/26 ‐ 2:00 ‐ 3:00 ‐ Safa Abdelhakim Monday 9/26 ‐ 4:00 ‐ 5:00 ‐ Harrison Dai Tuesday 9/27 ‐ 8:30 AM ‐ 9:30 AM ‐ Redwan Ahmed Tuesday 9/27 ‐ 10:30 ‐ 11:30 AM ‐ Dana Opulente Tuesday 9/27 ‐ 2:00 ‐ 3:00 ‐ Dana Opulente BRING YOUR QUESTIONS; TA’s do not make presentaBons
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The evoluBon of cells Cell membranes are needed to enclose and protect the molecular components -conserve and concentrate valuable macromolecules and energy sources controllable inside environment for metabolism (e.g. ion concentrations) Enclosed membranes can form spontaneously by phospholipids in aqueous solution “protocells”
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