2024 SAJC Prelim 9744 Biology P2 (A)(3)

1 St Andrew’s Junior College 2024 9744/02/Preliminary Examinations Civics Group Index Number Name (use BLOCK LETTERS) ST. ANDREW’S JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATIONS H2 BIOLOGY 9744/2 Paper 2 Friday 23rd August 2024 2 hours Materials: Question Paper Set A and Set B READ THESE INSTRUCTIONS FIRST Write your name, civics group and index number on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagram, graph or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. Write your answers in the spaces provided on the question paper. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiners’ Use 1 /10 2 /10 3 /12 4 /10 5 /9 6 /10 7 /10 8 /10 9 /5 10 /4 Total /100 This document consists of 27 printed pages and 0 blank page. [Turn over H2

2 St Andrew’s Junior College 2024 9744/02/Preliminary Examinations QUESTION 1 (a) Table 1.1 lists cell structures that can be found in eukaryotic cells or prokaryotic cells. Some of these cell structures can be found in both types of cell. Complete the table using a tick () to show that the cell structure can be present in a particular type of cell and a cross (✗) to show that the cell structure cannot be present. Put a tick or a cross in every box. The top row has been completed for you. Table 1.1 [2] 1 mark for each correct column

3 St Andrew’s Junior College 2024 9744/02/Preliminary Examinations (b) All cells have a cell surface membrane. Fig. 1.1 shows a transmission electron micrograph of part of two adjacent animal cells, cell 1 and cell 2. Fig. 1.1 In the space provided, draw a diagram of the region in the box labelled R in Fig. 1.1. Your diagram should show the four dark lines. Label the diagram to identify what is shown by the dark lines and each of the three spaces between them. space for diagram: diagram showing: 1 dark line(s) labelled as phosphate heads ;Accept phospholipid heads 2 clear area(s) between pairs of dark lines labelled as, fatty acid tails / hydrocarbon chains / hydrophobic core / AW ; Reject if pointing to intercellular space 3 clear area between the two cell surface membranes labelled as, interstitial fluid / tissue fluid / extracellular matrix / intercellular space ;Accept intercellular, area / region [3] Phosphate head Extracellular matrix Fatty acid tails

4 St Andrew’s Junior College 2024 9744/02/Preliminary Examinations Fig. 1.2 is a transmission electron micrograph of part of a hepatocyte showing some cell structures. The peroxisome shown in Fig. 1.2 is a spherical organelle bound by a single membrane. It carries out a variety of enzyme-catalysed metabolic reactions, including detoxification. Some of t