Bendemeer Sec Pure Bio 2024 P1, P2, MS

CANDIDATE NAME CLASS INDEX NUMBER ------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------------------------------------- READ THESE INSTRUCTIONS FIRST Write in 2B pencil. Write your name, class and register number on the work you hand in. Do not use paper clips, glue or correction fluid. There are forty questions on this paper. Answer all questions. For each question, there are four possible answers A , B , C and D . Choose the one you consider correct and record your choice in 2B pencil on the Answer sheet. Read the instructions on the Answer sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done on the question paper. The use of approved scientific calculator is expected, where appropriate. This document consists of 20 printed pages. BIOLOGY 6093 / 01 Paper 1 27 August 2024 1 hour

2 1 The diagram represents the cell structures of a human liver cell, a leaf palisade and a human red blood cell. What is cell structure X? A cell wall B chloroplast C cytoplasm D nucleus 2 Four students ( A , B , C and D ) were asked to match the function with the appearance of some cell structures in an animal cell. The functions were listed below. I detoxifies harmful substances II mRNA passes through to the ribosome III stores and packages hydrolytic enzymes The appearances were listed by letter. V a double membrane interspersed with pores W a double membrane with highly folded inner layer X membrane-bound sacs, arranged as a flattened stack Y membrane-bound, network of tubular spaces Z non-membrane bound, spherical structures Which student correctly matched the function with the appearance of the cell structure? I II III A V W Y 6093/01 / Sec Four Express / PRELIM / BDMS 2024

3 B V Y Z C Y V X D Y W Z 3 Four freshly cut potato cylinders were soaked for one hour in different salt solutions. The potato cylinders were then pinned to cork blocks. Two of the potato cylinders are shown. Which solution would cause the potato cylinder to be the most flaccid? A 0.1 mol per dm 3 salt solution B 0.3 mol per dm 3 salt solution C 0.7 mol per dm 3 salt solution D 1.0 mol per dm 3 salt solution 4 An experiment was carried out to investigate the effect of surface area to volume ratio on diffusion. A block of agar containing sodium hydroxide solution and Universal Indicator solution was cut into three smaller blocks of different sizes, as shown. All dimensions are in centimetres. The block were placed in a solution of 0.1 mol/dm 3 hydrochloric acid. As the hydrochloric acid diffused into each block, a colour change was observed. The time taken for each block to change its colour completely was recorded. Which statement is correct? A Although H and G have equal volumes, it will take less time for G to change colour completely. 6093/01 / Sec Four Express / PRELIM / BDMS 2024 [TURN OVER

4 B H will take more time than G to change colour completely, as H has a larger surface area for each unit of volume. C The length, width and breadth of F are double that of G. Compared to G, this halves the surface area to volume ratio and increases the time taken for F to change colour completely. D The smaller the surface area of a block, the longer the time taken to change colour completely. 5 The diagram shows two food tests being caried out on solution X. Which nutrients are present in solution X? A protein and starch B protein and sugar C starch and fat D starch and sugar 6 The diagrams are models representing three different biomolecules, P, Q and R (not drawn to scale). Which statements about P, Q and R are correct? I P is similar to glycogen as it contains glucose as its basic units. II P and Q are similar as they both contain the elements C, H and O only. 6093/01 / Sec Four Express / PRELIM / BDMS 2024

5 III R belongs to a group of biomolecules that always contain the elements C, H, O and N. IV R is synthesised from basic units glycerol and fatty acids. A I and II B I and IV C II and III D III and IV 7 The graph shows curve X which represents the activity of an enzyme at 20 o C. Which curve represents the activity when the temperature is raised to 30 o C and with more enzymes added? 8 Four statements about the active site of an enzyme in the human body are given. I The shape of the active site changes when the temperature falls to 10 o C and does not return to its original shape when the temperature returns to 37 o C. II The active site of an enzyme has the same shape as the substrate molecule. III The specificity of the enzyme depends on the shape of its active site. IV The shape of the active site changes when the enzyme is heated to 60 o C and does not return to its original shape when the temperature returns to 37 o C. Which statements are correct? A I, II and III only B I and IV only C II and III only D III and IV only 6093/01 / Sec Four Express / PRELIM / BDMS 2024 [TURN OVER

6 9 A student is fasting. What effect will this have on the composition of the blood in the hepatic portal vein, hepatic vein and hepatic artery? hepatic portal vein hepatic vein hepatic artery A high in glucose high in glucose low in glucose B high in glucose low in glucose high in glucose C low in glucose high in glucose low in glucose D low in glucose low in glucose high in glucose 10 Digestive juices were collected from different regions of the alimentary canal. Drops of these juices were added to a glass plate coated with starch gel as shown in the diagram. After 1 hour, the starch gel was rinsed with distilled water and iodine solution was added to each spot. Which row shows the correct results? spot 1 spot 2 spot 3 6093/01 / Sec Four Express / PRELIM / BDMS 2024

7 A blue-black blue-black brown B brown blue-black blue-black C brown blue-black brown D brown brown blue-black 11 The pressure of blood flowing through the heart changes during the cardiac cycle. The table shows some values for the pressure in the chambers of the right side of the heart and the pulmonary artery. Which row shows the correct values when the atrioventricular valves are opened, and the semilunar valves are closed? pressure in right atrium/ mmHg pressure in right ventricle/ mmHg pressure in pulmonary artery/ mmHg A 2 25 25 B 8 5 25 C 2 25 5 D 8 5 5 12 The diagram shows how the volume of blood in the left ventricle of a human heart changes during one heartbeat. When is the left ventricle contracting? 6093/01 / Sec Four Express / PRELIM / BDMS 2024 [TURN OVER

8 13 Reactions X and Y take place within the human body. Which row correctly matches X and Y to the site where each occurs, and whether an enzyme is needed? reaction X reaction Y enzyme needed location enzyme needed location A yes alveoli yes red blood cell B no plasma no alveoli C no red blood cell yes red blood cell D yes red blood cell no plasma 14 The table shows the concentration levels of different substances present in the blood of a blood vessel found in the human body. What could be the identity of this blood vessel? A aorta B hepatic portal vein C pulmonary vein D vena cava 15 Asthma is a lung disease triggered by the inhalation of an allergen such as pollen or du