9700_w08_ms_4 - UNIVERSITY OF CAMBRIDGE INTERNATIONAL...

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Advanced Subsidiary Level and GCE Advanced Level MARK SCHEME for the October/November 2008 question paper 9700 BIOLOGY 9700/04 Paper 4 (Theory 2), maximum raw mark 100 This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination. CIE will not enter into discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the October/November 2008 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.
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Page 2 Mark Scheme Syllabus Paper GCE A/AS LEVEL October/November 2008 9700 04 © UCLES 2007 Question Expected Answers Marks 1 (a) eukaryotic prokaryotic 1. linear / strands or circular ; 2. in nucleus or (free) in cytoplasm ; 3. associated with, proteins or histones or naked ; 4. in chromosomes or not in chromosomes ; assume eukaryotic if not stated [2 max] (b) 1 2 3 4 5/6 habitat destruction / deforestation ; disease ; fall in prey numbers / difficulty in finding food ; increased competition (with other carnivores) ; ref. named human activities ; ; e.g. killing / agriculture / logging R pollution [3 max] (c) 1 2 3 4 national parks ; zoos ; captive breeding programmes ; AVP ; e.g. banning hunting / gamete banks / education qualified [2 max] [Total:7] 2 (a) (i) acts as chloride channel ; A C l R chlorine C l moves out (of cell) ; active transport / binding site for ATP ; [2 max] (ii) E on diagram / upper face, because this is where, oligosaccharides / glycocalyx / carbohydrate chains, are present ; A glycoprotein R glycolipid [1]
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Page 3 Mark Scheme Syllabus Paper GCE A/AS LEVEL October/November 2008 9700 04 © UCLES 2007 (b) (i) form / variety / version, of a gene ; only affects phenotype when dominant allele not present / AW ; [2] (ii) 1. thick / sticky / dehydrated, mucus produced ; 2. mucus not moved effectively by cilia / mucus accumulates ; 3. reduced gaseous exchange / longer diffusion pathway ; 4. difficulty in breathing ; 5. more infections / (mucus) traps bacteria ; 6. lungs are scarred ; [3 max] (c) viral DNA carries normal (CFTR), allele / gene ; R RNA A recombinant DNA virus binds (with lung cells) ; viral DNA put into, (lung) cells / host DNA ; [2 max] (d) (i) 1. translation will not occur normally ; 2. no amino acid added to chain when stop codon reached ; 3. protein chain not completed / protein only partially made
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9700_w08_ms_4 - UNIVERSITY OF CAMBRIDGE INTERNATIONAL...

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