2025 ASRJC H2Bio PE P3 (Ans)

ASRJC BIOLOGY DEPT 9744/2025/J2PRELIM/P3 [Turn over H2 ANDERSON SERANGOON JUNIOR COLLEGE HIGHER 2 2025 JC2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 5 / INDEX NUMBER BIOLOGY 9744/03 Paper 3 Long Structured and Free-response Questions Candidates answer on the Question Paper. No Additional Materials are required. 26 August 2025 Tuesday 2 hours READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graph. Do not use paper clips, highlighters, glue or correction fluid. Section A Answer all questions in the spaces provided on the Question Paper. Section B Answer any one question in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 24 printed pages. For Examiner’s Use 1 2 3 or 4 Total / 75

2 ASRJC BIOLOGY DEPT 9744/2025/J2PRELIM/P3 [Turn over Section A Answer all the questions in this section. 1 The pre valence of type 2 diabetes is steadily increasing. Diabetes occurs either when the pancreas fails to synthesise enough insulin or when insulin resistance develops. Insulin resistance is when the body is unable to respond to insulin. (a) Fig. 1.1 represents, in outline, the basic mechanism involved in the release of insulin from pancreatic β cells in response to increased blood glucose concentrations. not to scale Fig. 1.1 (i) Fig. 1.1 contains the following substances, which are not given to scale: glucose ATP Ca2+ insulin Arrange the substances in order of increasing actual physical size. [1] 1. Ca2+, glucose, ATP, insulin process X

ASRJC BIOLOGY DEPT 9744/2025/J2PRELIM/P3 (ii) Glucose enters the pancreatic β cell via glut2. Outline how glucose is used to increase ATP concentration in the cell in Fig. 1.1. In your answer, highlight specific locations in the cell. [5] (max 3 if at least one correct location is not given) 1. Glucose undergoes glycolysis in