2021 EJC Promo JC1 P1 Bio (A)

©EJC 2021 9744/01/J1H2PROMO/2021 [Turn over EUNOIA JUNIOR COLLEGE JC1 Promotional Examinations 2021 General Certificate of Education Advanced Level Higher 2 H2 Biology Paper 1 Multiple Choice 9744/01 05 October 2021 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, glue or correction tape/fluid. Write your name, civics group and registration number on the Answer Sheet in the spaces provided. There are thirty Multiple Choice Questions in this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages. ANSWERS

2 ©EJC 2021 9744/01/J1H2PROMO/2021 1 Raffinose is a trisaccharide which can be degraded by enzymes. The results of two different enzymatic incubations are shown here: enzyme used products sucrase melibiose and fructose galactosidase galactose and sucrose Which statements are consistent with the results shown above? 1 Raffinose is composed of two different monosaccharides. (False – from the table, besides fructose and galactose, we can derive that the other monosaccharide is glucose, as sucrose = fructose + glucose) 2 Melibiose is a dissaccharide. (True – from digestion by sucrose; melibiose is made up of glucose and galactose) 3 Acid hydrolysis of raffinose would yield glucose. (True – the high heat and acid would hydrolyse the glycosidic bond joining glucose and fructose in sucrose , yielding glucose as stated) 4 The products of raffinose digestion by sucrase and galactosidase will each yield an orange - red precipitate when heated with Benedict's reagent. (True – since both fructose and glucose will be released and these reducing sugars will give an orange-red ppt with Benedict’s test). A 1 and 3 only B 2 and 4 only C 2, 3 and 4 only D 1, 2, 3 and 4 2 In triglyceride molecules, where are carbon-carbon double bonds located? A between fatty acids and glycerol (the ester bond has a carbon-oxygen (C=O) double bond) B within fatty acids and within glycerol (no carbon-carbon double bonds within glycerol) C within fatty acids only (only the fatty acid chains have the carbon-carbon (C=C) double bonds) D within glycerol only (no carbon-carbon double bonds)

3 ©EJC 2021 9744/01/J1H2PROMO/2021 [Turn over 3 Which correctly matches the functional and structural features of cellulose, collagen, glycogen and triglyceride? key: ✓= true ✗= false function structure fibrous molecule held tog