EJC 2023 H2 9744 P2 (ans)

©EJC 2023 9744//02/J2H2PRELIM/2023 [Turn over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examinations 2023 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 2 - REGISTRATION NUMBER H2 Biology Paper 2 Structured Questions 9744/02 14 September 2023 2 hours READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. Candidates are to answer: All questions on the Question Paper. Write your answers in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use paper clips, highlighters, glue, or correction fluid/tape. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 22 printed pages and 2 blank pages. For Examiner’s Use 1 2 3 4 5 6 7 8 9 10 Total

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3 ©EJC 2023 9744/02/J2H2PRELIM/2023 [Turn over Answer all questions. 1 Fig. 1.1 shows an electron micrograph of a eukaryotic cell. (a) (i) Fill in the table to identify structures A and D and show their functions. Structure Identity Function A Nucleolus (R: nucleus) 1. Site of rRNA synthesis; OR 2. S ite of assembly of ribosomal proteins with rRNA to form small and large subunits of ribosomes / ribosomal subunits; D Cell surface membrane (R: cell membrane) (A: plasma membrane) It acts as a barrier which controls the movement of various substances in and out of the cell due to its partial permeability; @ 1 mark per pair [2] (ii) Using the width of structure C as indicated by the arrow in Fig. 1.1 , calculate the magnification of the electron micrograph. Show your working clearly. 1. Length of arrow = 1.4 cm = 14,000 µm, actual width of chloroplast = 1.4 x 2 = 2.8 µm; 2. Magnification = 14,000 / 2.8 = x5,000 or 5,000 times [2] (R: answers without statement(s) to explain the different components of the equation) Fig. 1.1 B 2 µm D A C

4 ©EJC 2023 9744/02/J2H2PRELIM/2023 (b) Fig. 1.2 is an electron micrograph of three cells of the same species of bacterium, Erwinia carotovora. (i) Name two structures found in animal cells which are not present in the cells shown in Fig. 1.2. [2] Any two of the following: 1. Mitochondrion / mitochondria; (R: chloroplast) 2. Nucleus / nuclear membrane / nuclear envelope; 3. Nucleolus; 4. DNA associated with, histones / protein(s); (A: chromosomes / linear DNA) 5