AHS Prelim 2025 Biology P2 QP

1 Anglican High School 2025_Prelim_S4_BIO_P2 ANGLICAN HIGH SCHOOL SECONDARY FOUR PRELIMINARY EXAMINATION 2025 CANDIDATE NAME CLASS INDEX NUMBER BIOLOGY 6093/02 Paper 2 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. For Examiner’s Use Section A / 70 Section B / 10 Total / 80 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 21 printed pages. Section A S4 4

2 Anglican High School 2025_Prelim_S4_BIO_P2 Answer all questions. 1 Fig. 1 .1 shows e nzyme 1 catalysing the breakdown of molecule A into two smaller molecules, B and C. Fig. 1.1 (a) Suggest the identity of enzyme 1 and molecule A. enzyme 1…………………………………………………………………………………… … . molecule A…………………………………………………………………………………… .. [2] Molecule D, shown in Fig. 1.2, is added to the mixture shown in Fig. 1.1. This causes the rate of production of molecules B and C to decrease. Fig. 1.2 molecule A molecule B molecule C enzyme 1 molecule A molecule D enzyme 1

3 Anglican High School 2025_Prelim_S4_BIO_P2 (b) (i) Using the information in Fig. 1.1 and Fig. 1.2, explain why the rate of production of molecules B and C decreases after molecule D is added. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………… ...[3] (ii) An example of molecule D is cyanide which can bind to an enzyme present in the mitochondria of cells. This enzyme is involved in aerobic respiration reactions. Suggest and explain the effect of cyanide poisoning on a person. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………… ...[3] [Total:8] 2 (a) Fig. 2 is a diagram of a bacterial cell. Fig. 2 (i) Using letters A – F, identify two parts of the cell that contain DNA. …………………and .…………………