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GCE JUN 2006 : (AS 3) Practical Processes

14 pages, 20 questions, 3 questions with responses, 3 total responses,

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ERRATUM NOTICE General Certificate of Education Biology Paper AS 3A [ASB31] Tuesday 20 June, Morning INSTRUCTION TO INVIGILATOR Before the start of the examination please ask candidates to amend their question paper as follows: Please turn to page 8 of your question paper. (Pause) Go to the final word of the fifth line which reads lactose . (Pause) This should read sucrose (Spell out) s-u-c-r-o-s-e. (Pause) Repeat Please turn to page 8 of your question paper. (Pause) Go to the final word of the fifth line which reads lactose . (Pause) This should read sucrose (Spell out) s-u-c-r-o-s-e. (Pause) Please make this change now. This is the end of the announcement. Centre Number 71 Candidate Number ADVANCED SUBSIDIARY (AS) General Certificate of Education 2006 Biology assessing Module 3A: Practical Processes ASB31 Assessment Unit AS 3A [ASB31] TUESDAY 20 JUNE, MORNING TIME 1 hour. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Write your answers in the spaces provided in this question paper. Answer all five questions. You are provided with Photograph 3.2 for use with Question 2 in this paper. Do not write your answers on this photograph. For Examiner s use only Question Number INFORMATION FOR CANDIDATES The total mark for this paper is 50. Quality of written communication will be assessed in questions 1(a), 3(a), 3(b) and 4(c), (denoted in the paper with an asterisk, *), and awarded a maximum of 2 marks. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question or part question. 1 2 3 4 5 QWC Total Marks ASB3AS6 1204 Marks 1 The enzyme amylase will digest starch to produce a reducing sugar. Examiner Only Marks Remark * (a) Explain how you would use the iodine test to measure the progress of starch digestion by amylase. _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _______________________________________________________ [3] (b) Name the sugar produced as a result of the digestion of starch. _______________________________________________________ [1] (c) Describe the use of Benedict s test to detect the presence of reducing sugar. _________________________________________________________ _________________________________________________________ _________________________________________________________ _______________________________________________________ [2] (d) State the chemical for which clinistix is the test. _______________________________________________________ [1] ASB3AS6 1204 2 [Turn over 2 Photograph 3.2 is a photomicrograph of a section through part of the ileum. Examiner Only Marks Remark In the space below draw a large block diagram to show the tissue layers visible in this section. In the drawing identify at least five of the following structures: Columnar epithelium Crypt of Lieberk hn Goblet cell Lacteal Mucosa Muscularis externa Muscularis mucosa Submucosa Villus [10] ASB3AS6 1204 3 [Turn over 3 The apparatus shown below and opposite are used in ecological investigations. Examiner Only Marks Remark For each one, name the apparatus, state its role in ecological investigations and describe how it is used. * (a) Name _____________________ Role ________________________________________________________ _____________________________________________________________ Procedure for use _____________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ __________________________________________________________ [4] ASB3AS6 1204 4 [Turn over * (b) Examiner Only Marks Remark Name _____________________ Role ________________________________________________________ _____________________________________________________________ Procedure for use _____________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ __________________________________________________________ [4] ASB3AS6 1204 5 [Turn over 4 If a water flea (Daphnia pulex) is viewed under a microscope, its heart is visible through the translucent cuticle. The diagram below shows a water flea and the position of some organs, including the heart. eye eye Examiner Only Marks Remark heart gut 1 mm In an investigation into the effect of cooling on heart rate, a water flea was placed in a small petri dish under a microscope and either water at room temperature or iced water added to the dish at the commencement of the experiment. In each case the number of heart contractions per minute was measured, at 2-minute intervals, over a 10-minute period. The results are shown in the table below. Time/minutes 0 2 4 6 8 10 Heart rate in water at room temperature/beats minute 1 184 188 189 190 192 196 Heart rate in iced water /beats minute 1 184 106 74 68 90 150 (a) Plot the above results, using an appropriate graphical technique. (Use the graph paper opposite.) [8] (b) Calculate the proportional decrease in the heart rate after 4 minutes in iced water. (Show your working in the space below.) Answer __________________ [3] * (c) Suggest an explanation for the changes shown in the graph. _________________________________________________________ _________________________________________________________ _________________________________________________________ _______________________________________________________ [2] ASB3AS6 1204 6 [Turn over ASB3AS6 1204 7 [Turn over 5 Respiration in yeast involves the metabolism of sugar and the production of carbon dioxide as a waste product. The rate of production of carbon dioxide is an indicator of the rate of respiratory metabolism. You are asked to devise a plan to test the hypothesis that yeast has a higher rate of respiration when glucose (a monosaccharide) is supplied than when either maltose or lactose (both disaccharides) is supplied. Examiner Only Marks Remark You are supplied with yeast suspension separate solutions of glucose, maltose and sucrose the apparatus shown below syringe gas given off by yeast sugar + yeast mixture rubber tubing capillary tube meniscus scale (a) From your understanding of the structure of sugars and of the absorption of molecules by cells, explain why you might expect the yeast to have a higher rate of respiration when glucose is supplied than when either of the other two sugars is supplied. _________________________________________________________ ________________________________________________________ _________________________________________________________ _______________________________________________________ [2] ASB3AS6 1204 8 [Turn over (b) The type of sugar is the independent variable in this investigation. Describe how you would control each of two other variables. Examiner Only Marks Remark 1. ______________________________________________________ _________________________________________________________ 2. ______________________________________________________ _______________________________________________________ [2] (c) Describe how you would measure the rate of carbon dioxide production. _________________________________________________________ _________________________________________________________ _________________________________________________________ _______________________________________________________ [2] (d) Describe what control experiment you would need to undertake, and explain its role. _________________________________________________________ _________________________________________________________ _________________________________________________________ _______________________________________________________ [2] (e) Explain how you would present your results graphically. _________________________________________________________ _________________________________________________________ _________________________________________________________ _______________________________________________________ [2] Quality of written communication ASB3AS6 1204 9 [Turn over THIS IS THE END OF THE QUESTION PAPER ASB3AS6 1204 10 [Turn over Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. S 5/05 6900 302507(39) [Turn over GCE Biology Advanced Subsidiary (AS) Assessment Unit AS 3A Module 3A: Practical Processes Summer 2006 Photograph 3.2 (For use with Question 2) Source: Advanced Level Biology Practical, Jane Hawkes and Fiona Eldridge, DP Publications Ltd, 1989. ASB3AS6 1204.02 IN ASB31IN1

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Additional Info : Gce Biology June 2006 Assessment Unit AS 3 Module 3A: Practical Processes
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