2025 TMJC H2Bio PE P2 (QP)

CANDIDATE NAME CIVICS GROUP H2 BIOLOGY 9744/02 Paper 2 Structured Questions 17 September 2025 2 hours Candidates answer on the Question Paper. No additional materials are required. READ THESE INSTRUCTIONS FIRST Write your name and Civics Group in the spaces at the top of the page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions 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. The number of marks is given in brackets [ ] at the end of each question or part question. ______________________________________________________________________________________ This document consists of 31 printed pages and 3 blank pages. For examiner’s Use 1 / 13 2 / 7 3 / 9 4 / 7 5 / 7 6 / 13 7 / 7 8 / 10 9 / 9 10 / 8 11 / 10 Total / 100 TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION

2 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Biology Answer all questions. 1. Fig. 1.1 shows a diagram of a glycosphingolipid, a type of lipid found in the cell surface membranes of most eukaryotic organisms. Fig. 1.1 (a) Compare the structures of the glycosphingolipid and phospholipids. [2] ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... (b) Suggest a role of the glycosphingolipid in the cell surface membrane. [1] ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... (c) Glucocerebrosidase is a glycosidase enzyme that breaks down glycosphingolipids by removing the saccharide portion of the molecule. Another example of a glycosidase enzyme is maltase that breaks down maltose into glucose molecules. Draw an arrow in Fig. 1.1 to show which bond glucocerebrosidase hydrolyses in the glycosphingolipid. [1]

3 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Biology (d) Fig. 1.2 shows the results of an experiment conducted to investigate the activity of glucocerebrosidase at various pH levels. Fig. 1.2 Explain why there is no enzyme activity below pH 3. [3] ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………………………………………………………………………………………... ………………………