9700_w02_ms_5

9700_w02_ms_5 - CAMBRIDGE INTERNATIONAL EXAMINATIONS...

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Unformatted text preview: CAMBRIDGE INTERNATIONAL EXAMINATIONS NOVEMBER 2002 GCE Advanced Level UNIVERSITYofCAMBRIDGE Local Examinations Syndicate _ _m1£ma_ Syllabus A Level Examinations - November 2002 9700 n “ Expected Answers m Additional Guidance Nucleus — correct relative size (>1/2) Nucleus / nuclear membrane labelled Nucleolus labelled Cell wall -2 lines - labelled Chromatin One other correct label Reject chromosomes If not interphase then max 3 ignore cell membrane Quality of drawing —- it must be real Correct stages labelled _ Chromosomes / chromatids —- correct labels — 1 mark each One other correct label Quality of drawing — it must be real Elongate Nucleus intact Vacuole labelled Small nucleus relative to cell (<1/4) —IEIEE_ Syllabus _ A Level Examinations — November 2002 9700 n S6 no change 87 bubbles / reaction 88 no change Accept relative descriptions SQ slower than 87 $6 catalase denatured Explanation of denaturisation Allow denature mark if good 37 has catalase explanation 88 is control Explanation of control 89 dilution reduces rate of reaction Explanation of why dilution affects rate of reaction Repeat and average Shoots of same mass I length / size Make it quantitative ie measure volume of oxygen Control temperature Same age / variety Control pH Equalise pressure Acts as control Close tap and or screw clip Stabilise “ Note position of manometer fluid and start clock Note position of syringe Read position of fluid at fixed time Equalise levels with syringe ----Read off volume change in syringe Method to calculate rate ‘ Remove KOH Replace with water I I Determine difference between 02 and CO2 ...
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9700_w02_ms_5 - CAMBRIDGE INTERNATIONAL EXAMINATIONS...

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