2024 TJC H2 Bio P2 QP

1 [TURN OVER READ THESE INSTRUCTIONS FIRST Write your Center number, index number 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. 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 . TEMASEK JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER BIOLOGY 9744/02 Paper 2 Structured Questions 23 AUGUST 2024 2 hours Candidates answer on the Question Paper. No Additional Materials are required. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 / 10 2 / 9 3 / 9 4 / 13 5 / 8 6 7 8 9 10 Answer all questions. This document consists of 27 printed pages and 1 blank page.

2 Answer all questions. 1 (a) Fig. 1.1 is a diagram of a section through a mitochondrion. Fig. 1.1 (i) On Fig 1.1, use label lines and letters to label the positions where the following reactions take place: X - Link reaction Y - Krebs cycle Z - Oxidative phosphorylation [3] (ii) The four arrows, A, B, C and D, show the movement of molecules and ions. Use the letters to identify all the arrows (one or more) that show: Active transport of protons ...................................................................................................... Diffusion of carbon dioxide ………………............................................................................... [2] (b) Compare the process of oxidative phosphorylation with photophosphorylation. …………….….…………………………………………………………………………………………….. …………….….…………………………………………………………………………………………….. …………….….…………………………………………………………………………………………….. …………………….………………………………………………………………………………………… .……………….…..……………………………………………………………………………………… [2]

3 [TURN OVER (c) Apart from channel proteins that allow transport of ions, plant and animals cells also have channel proteins such as aquaporins which permits the movement of water across membranes. Explain why aquaporins are necessary. …………….….…………………………………………………………………………………………….. …………….….…………………………………………………………………………………………….. …………….….…………………………………………………………………………………………….. …………….….…………………………………………………………………………………………….. …………….….…………………………………………………………………………………………….. …………………….………………………………………………………………………………………… .……………….…..……………………………………………………………………………………… [3] [Total: 10]

4 2 Fig. 2.1 shows the primary structure of a section of a polypeptide chain of collagen. Fig. 2.