Biology HL paper 3 TZ1 MAY 06 - 2206-600920

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Unformatted text preview: 2206-600920 pagesM06/4/BIOLO/HP3/ENG/TZ1/XXFriday 5 May 2006 (morning)BIOLOGYHIGHER LEVELPAPER 3IB DIPLOMA PROGRAMMEPROGRAMME DU DIPLÔME DU BIPROGRAMA DEL DIPLOMA DEL BIINSTRUCTIONS TO CANDIDATES• Write your session number in the box above.• Do not open this examination paper until instructed to do so.• Answer all of the questions from two of the Options in the spaces provided. You may continue your answers on answer sheets. Write your session number on each answer sheet, and attach them to this examination paper and your cover sheet using the tag provided.• At the end of the examination, indicate the letters of the Options answered in the candidate box on your cover sheet and indicate the number of answer sheets used in the appropriate box on your cover sheet.1 hour 15 minutesCandidate session number0120220660092206-6009– 2 –M06/4/BIOLO/HP3/ENG/TZ1/XXOption D — EvolutionD1.The cyanobacterial genus Synechococcusis found in hot springs. Five strains (Synechococcus strain 1 to 5) were isolated from a hot spring in Oregon (USA) and tested for tolerance to high temperatures. The phylogeny in the fgure below shows one common ancestor and relationships between the fve strains. The growth rates oF each oF these fve strains were determined at different temperatures. Synechococcus strain 1Synechococcus strain 2 Synechococcus strain 3Synechococcus strain 4Synechococcus strain 5growth rate / arbitary units day–1growth rate /arbitary units day–1growth rate / arbitary units day–1growth rate / arbitary units day–1growth rate /arbitary units day–1Temperature / °C[Source: S Miller and R W Castenholz, Application and Environmental Microbiology, (2000), 66, pages 4222–4229](This question continues on the following page)CommonAncestor02202206-6009– 3 –Turn overM06/4/BIOLO/HP3/ENG/TZ1/XX(Question D1 continued)(a) (i) Identify, giving a reason, which strain would have the largest population after a growth period of 24 hours at a temperature of 45 °C.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[1](ii) State the names of two strains most distantly related on the phylogeny.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
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This note was uploaded on 10/01/2009 for the course BIO 19839791 taught by Professor Ms.nerd during the Spring '09 term at International University of Sarajevo.

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Biology HL paper 3 TZ1 MAY 06 - 2206-600920

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