2023 JC1 H1 EOY P2 QP

1 DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN [TURN OVER DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN READ THESE INSTRUCTIONS FIRST Write your name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. 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 any 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 Section A / 15 Section B 1 / 6 2 / 8 3 / 8 4 / 13 Section C Essay / 15 Total / 65 TEMASEK JUNIOR COLLEGE PROMOTIONAL EXAMS 2023 Higher 1 CANDIDATE NAME CIVICS GROUP / 2 3 BIOLOGY 8876 SECTION B STRUCTURED QUESTIONS FRIDAY, 22 SEPTEMBER 2023 2 hours 10 minutes Candidates answer on the Question Paper. No Additional Materials are required. This document consists of 10 printed pages and 2 blank pages.

2 DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN Answer all questions. 1 Fig.1.1 shows a cell releasing insulin in response to glucose uptake. The uptake of glucose through Glucose Transporter 2 (GLUT2) causes a rise in ATP levels in the cell. This closes the potassium channel and in turn causes calcium channel to open. The influx of calcium ions leads to the release of insulin. Fig. 1.1 (a) (i) With reference to Fig. 1.1., describe two differences in the way insulin and glucose are transported across the cell surface membrane. ……….……………………………………….….…………………………………………………… …………………………………………………………….………………………………………….. ……….……………………………………….….…………………………………………………… …………………………………………………………….………………………………………….. …………….………………………………………………….…..…………………………….…. [2] (ii) Explain how the membrane proteins in Fig. 1.1 are able to transport the substances across the cell surface membrane. ……….……………………………………….….…………………………………………………… …………………………………………………………….………………………………………….. ……….……………………………………….….…………………………………………………… …………………………………………………………….………………………………………….. …………….………………………………………………….…..…………………………….…. [2]

3 DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN [TURN OVER DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN (b) Suggest with a reason how a secretory cell will differ in terms of organelles from a non-secretory cell. .…………….….…………………………………………………………………………………………….. …………………….………………………………………………………………………………………… .……………….…..……………………………………………………………………………………… [1] Fig. 1.2 shows an organelle in a eukar