E_Biology_HL_paper-3_N07_E - D O W N L O A D E D F R O M I...

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Unformatted text preview: D O W N L O A D E D F R O M I B P A P E R S . I N F O 8807-6003 21 pages N07/4/BIOLO/HP3/ENG/TZ0/XX+ Monday 5 November 2007 (morning) BIOLOGY HIGHER LEVEL PAPER 3 IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI INSTRUCTIONS TO CANDIDATES • Write your session number in the boxes 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 minutes Candidate session number © IBO 2007 0121 88076003 D O W N L O A D E D F R O M I B P A P E R S . I N F O 8807-6003 – 2 – N07/4/BIOLO/HP3/ENG/TZ0/XX+ Option D — Evolution D1. Proteins such as keratin and myosin consist of two or more alpha helices winding around each other into a super-coil and are known as long coiled-coil (LCC) proteins. Such proteins are involved in a wide variety of structural and mechanical processes in cells. A study was carried out to compare the presence of LCC proteins in species from different kingdoms. The LCC proteins were grouped by similarities in primary structure. They were then analysed to show family relationships and homology. The diagram below shows the distribution of groups of LCC protein sequences by kingdom. animals plants 304 47 82 1 5 4 17 prokaryotes [Source adapted from: A Rose, S Schraegle, E Stahlberg and I Meier, BMC Evolutionary Biology , (2005), 5 , page 66] (a) State how many groups of LCC proteins are common to all the species studied. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [1] (b) Calculate how many groups of LCC proteins are found in the prokaryote kingdom. Number of groups: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [1] (This question continues on the following page) 0221 D O W N L O A D E D F R O M I B P A P E R S . I N F O 8807-6003 – 3 – Turn over N07/4/BIOLO/HP3/ENG/TZ0/XX+ (Question D1 continued) (c) Calculate the percentage of groups analysed that are found in the animal kingdom only. Percentage of groups: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [1] (d) Deduce whether this data supports the hypothesis that plants are more closely related to animals than to prokaryotes....
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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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E_Biology_HL_paper-3_N07_E - D O W N L O A D E D F R O M I...

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