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 .………………… [1]

4 Anglican High School 2025_Prelim_S4_BIO_P2 (ii) State the function of the part labelled D. ……………………………………………………………………………………… ...[1] (iii) Food preservation includes methods used to prevent bacterial growth on food. One such method is salting, where the food is kept in bottles of concentrated salt solution. Using appropriate letters in Fig. 2, explain how salting can inhibit bacterial growth on foods. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………… ...[3] (b) Anthrax is a serious disease caused by the Bacillus anthracis bacteria. It was used in 2001 in the United States to attack people as a means of bioterrorism. According to the United States Centers for Disease Control and Prevention, getting antibiotics quickly is essential to saving lives during an anthrax attack. Describe two ways in which antibiotics work to kill the bacteria. ………………………………………………………………………………………………….. ………………………………………………………………………………………………… .. ……………………………………………………………………………………………… ….. ………………………………………………………………………………………………… .. ………………………………………………………………………………………………….. ……………………………………………………………………………………………… ..[2] [Total:7]

5 Anglican High School 2025_Prelim_S4_BIO_P2 3 (a) The glycaemic index (GI) is a numerical scale that ranks carbohydrate -containing foods based on how quickly they raise blood glucose concentrations after eating. Fig. 3.1 shows the effect on the blood glucose concentration after eating high GI food and low GI food. Fig. 3.1 (i) Starch is an example of a carbohydrate. Describe how starch is fully digested by the human digestive system. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………… ...[2] (ii) Suggest why consuming low GI food is better for health. …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………… ...[1] Blood glucose concentration Start of meal Time/ hours High GI food Low GI food

6 Anglican High School 2025_Prelim_S4_BIO_P2 (b) Fig. 3.2 shows the blood glucose concentrations of three different people, G, H and J, over a 48-hour period. Fig. 3.2 Two of the se people are diabetic. One of them p roduces small quantities of insulin . The other person produces no insulin. The third person is not diabetic. (i) Using the letters G, H and J, arrange the three people according to decreasing quantities of insulin produced. [1] …………………………………………………………………………………………… (ii) Explain how the non-diabetic person regulates his blood glucose concentration after a heavy meal of carbohydrates. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………...[ 5]

7 Anglican High School 2025_Prelim_S4_BIO_P2 (c) Diabetes is commonly treated by injection of insulin. AFREZZA® is a form of inhaled insulin that can be administered by breathing it in. Suggest how insulin taken by this route enters the blood. ………………………………………………………………………………………………….. ………………………………………………………………………………………………… .. ………………………………………………………………………………………………… .. ………………………………………………………………………………………………… .. ………………………………………………………………………………………………….. ……………………………………………………………………………………………… ..[3] [Total:12] 4 (a) Fig. 4.1 shows a capillary inside the human testis. Fig. 4.1 (i) Name one substance that is transported at S. ……………………………………………………………………………………… ...[1]

8 Anglican High School 2025_Prelim_S4_BIO_P2 (ii) With reference to Fig. 4.1, describe and explain one way in which capillaries are adapted to their function. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………