2015 HCI H2 Biology Prelims Paper 1 Questions

HWA CHONG INSTITUTION JC2 Preliminary Examinations Higher 2 CANDIDATE NAME CT GROUP 14S ___ CENTRE NUMBER INDEX NUMBER BIOLOGY Paper 1 Multiple Choice Additional Materials: Optical Mark Sheet 9648 / 01 17 September 2015 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES 1. Write your name, CT group, Centre number and index number in the spaces provided at the top of this cover page. 2. Fill in your particulars on the Optical Mark Sheet. Write your NRIC number and shade accordingly. 3. There are forty 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 Optical Mark Sheet. 4. At the end of the paper, you are to submit only the Optical Mark Sheet. INFORMATION FOR CANDIDATES 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 31 printed pages and 1 blank page.

2 © Hwa Chong Institution 2015 9648 H2 Biology / JC2 Preliminary Exams / Paper 1 1 The following electron micrographs show various organelles P to T present in a liver cell. Radioactive amino acids are supplied to the liver cell to synthesise insulin receptors. Which sequence shows the correct order in which these amino acids would be detected in the organelles during the synthesis of insulin receptors? A Q  T  R  P  S B Q  T  P  S C T  P  S  R D T  S  P P R S T Q

3 © Hwa Chong Institution 2015 9648 H2 Biology / JC2 Preliminary Exams / Paper 1 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 molecule s 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 – sucrose, cellulose as well as the products of complete hydrolysis of sucrose and cellulose. The diagram shows the chromatography results: Which row shows the correct results? sucrose cellulose products of complete hydrolysis of sucrose products of complete hydrolysis of cellulose A 4 3 1 2 B 3 4 2 1 C 1 2 3 4 D 2 1 4 3 absorbent paper solvent a mixture containing one or more types of molecules 1 2 3 4

4 © Hwa Chong Institution 2015