2019 EJC Promo JC1 P1 Bio (A)

©EJC 2019 9744/01/J1H2PROMO/2019 [Turn over EUNOIA JUNIOR COLLEGE JC1 Promotional Examinations 2019 General Certificate of Education Advanced Level Higher 2 H2 Biology Paper 1 Multiple Choice 9744/01 04 October 2019 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, glue or correction 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 23 printed pages and 1 blank page.

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3 ©EJC 2019 9744/0J1H2PROMO/2019 [Turn over 1 The following diagrams show short sections of some common polysaccharides and modified polysaccharides. 1 2 3 4 The four polysaccharides P, Q, R and S are described as follows: • Polysaccharide P is composed of β-glucose monomers with 1,4 glycosidic bonds. • Polysaccharide Q is composed of α-glucose monomers with 1,4 and 1,6 glycosidic bonds. • Polysaccharide R is composed of α-glucose monomers with 1,4 glycosidic bonds. • Polysaccharide S is composed of N-acetylglucosamine monomers with β-1,4 glycosidic bonds. Which row correctly pairs the polysaccharide with its structure? Polysaccharide P Q R S A 2 4 3 1 B 2 4 1 3 C 3 1 2 4 D 3 4 1 2 O H H O H O H O H H O H O H O H O H O H O H OH H CH2OH O OH C H O H H H O H O H OH H CH2OH O NHCOCH3 C H O H H H NHCOCH3

4 ©EJC 2019 9744/01/J1H2PROMO/2019 2 Chromatography is a technique used to separate molecules by their solubility. The diagram shows an apparatus used for this technique. As the solvent rises up the paper, the molecules with the greatest solubility in the solvent travel the greatest distances up the paper. When the solvent reaches the top of the paper, the paper is removed, dried and sprayed with a dye. The different molecules appear as coloured spots Chromatography was carried out on four different samples – lactose, cellulose, as well as the products of complete hydrolysis of lactose and cellulose. The diagram below shows the results for each sample. Which row correctly identifies the chromatogram of each sample? lactose cellulose hydrolysed lactose hydrolysed cellulose A 4 3 1 2 B 3 4 2 1 C 1 2 3 4 D 2 1 4 3