JPJC 2023 J2 H2 BI Prelim P2 QP

9744 / 02 [Turn over NAME : CLASS : JURONG PIONEER JUNIOR COLLEGE JC2 Preliminary Examination 2023 BIOLOGY Higher 2 9744/02 29 August 2023 Paper 2 Structured Questions 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your class and name in the spaces at the top of this 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. For Examiner’s Use 1 2 3 4 5 6 7 8 9 10 11 Total This document consists of 29 printed pages and 3 blank pages.

2 JPJC/JC2 H2 Biology/Prelims/2023 Answer all questions. 1 Fig. 1.1 shows a diagram of a cell surface membrane. Fig. 1.1 (a) The structure of the cell surface membrane is described as a fluid mosaic. Explain what is meant by the term fluid mosaic. .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... ............................................................................................................................... [2] (b) Outline the functions of the following components of the cell surface membrane. K ................................................................................................................................. .................................................................................................................................... L ................................................................................................................................. .................................................................................................................................... M ................................................................................................................................ .................................................................................................................................... N ................................................................................................................................. ............................................................................................................................... [4]

3 JPJC/JC2 H2 Biology/Prelims/2023 [Turn over (c) In an investigation, animal cells were exposed to different concentrations of glucose. The rate of uptake of glucose into the cells across the cell surface membrane was determined for each concentration. Fig. 1.2 shows the results. Fig. 1.2 Using the information in Fig. 1.2, explain how the results of the investigation support the idea that glucose enters cells by active transport. 9700/02/M/J/07 ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ................................................................................................................................. [2] (d) Active transport also involves other water -soluble substances such as Na + and K+, and the use of ATP to provide the energy needed for their transport through carrier proteins. Outline other features of active transport. 9700/22/M/J/22 ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ...................................................................................................................................... ................................................................................................................................. [2] [Total: 10]

4 JPJC/JC2 H2 Biology/Prelims/2023 2 Fibroblasts are one of the cell types of connective tissue s. The cells synthesise and secrete collagen, which forms part of the supporting external cellular environment, known as the extracellular matrix. Fig. 2.1 shows the primary structure of a section of a polypeptide chain of collagen. Fig. 2.1 (a) Explain how the primary structure shown in Fig. 2.1 indicates that the structure of the polypeptide is suited to be a component of a collagen molecule. .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... ............................................................................................................................... [3] (b) After final processing in the Golgi body, collagen is released to the outer surface of the cell by exocytosis. Describe the process of exocytosis. .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... .................................................................................................................................... ............................................................................................................................... [3]

5 JPJC/JC2 H2 Biology/Prelims/2023 [Turn over (c) Hydrolytic enzymes, known as collagenases, are secreted by cells in an inactive fo