EJC 2023 H2 9744 P2 (QP)

©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 28 printed pages. For Examiner’s Use 1 2 3 4 5 6 7 8 9 10 Total

2 ©EJC 2023 9744/02/J2H2PRELIM/2023 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 describe their functions. structure identity function A D [2] Fig. 1.1 B 2 µm D A C

3 ©EJC 2023 9744/02/J2H2PRELIM/2023 [Turn over (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. [2] (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] Fig. 1.2

4 ©EJC 2023 9744/02/J2H2PRELIM/2023 (ii) E. carotovora is a rod-shaped bacterium. Explain why two of the bacterial cells in Fig. 1.2 do not appear rod-shaped. …………………………………………………………………………………………………. ………………………………………………………………………………………………[1] (iii) Scientists think that the origins of structures B and C of Fig. 1.1 were very different from that of eukaryotic cells. The evidence for this is that they both have features in common with bacterial cells like E. carotovora. Compare the structural features of B and/or C with E. carovotora; …………………………………………………………………………………………