2024 RI H2 Bio P1 QP

© RI 2024 Preliminary Examination 9744/01 [Turn over RAFFLES INSTITUTION 2024 Year 6 Preliminary Exam Higher 2 BIOLOGY 9744/01 Paper 1 Multiple Choice 24 Sept 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and shade your Index Number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty 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. (Erase all mistakes completely. Do not bend or fold the OMR Answer Sheet). This document consists of 20 printed pages. Raffles Institution Internal Examination

2 © RI 2024 Preliminary Examination 9744/01 1. The figure below shows part of the structure of a proteinaceous enzyme. Which of the following correctly describe the structure in box Z? number of amino acids present number of types of bond (s) present between amino acids A cannot be determined only 2 B approximately 11 amino acids only 2 C approximately 10 amino acids only 3 D approximately 7 amino acids only 1

3 © RI 2024 Preliminary Examination 9744/01 [Turn over 2. The end-product of a metabolic pat hway can act as a competitive inhibitor. This is called end-product inhibition and allows a cell to control a metabolic pathway. The diagram shows a metabolic pathway where the end-product could act as an inhibitor of enzyme W. Which of the following statements would be true if enzyme Z was inhibited by the end-product instead of enzyme W? 1 The quantity of intermediate 1 would increase 2 The quantity of interm ediate 1 would decrease 3 The quantity of end-product would remain unchanged 4 The quantity of intermediate 3 would decrease 5 There would be wastage of resources A 1 and 5 only B 2, 3 and 4 only C 1, 3 and 5 only D 2, 3, 4 and 5 only

4 © RI 2024 Preliminary Examination 9744/01 3. Four students were asked to match the function of some cell structures in an animal cell with their appearance. The functions were listed by number. 1 produces the mito