SGSS Pure Biology Prelim 2024 Paper 1

St. Gabriel’s Secondary School 2024 ‘O’ Preliminary Examination Subject : Biology Paper : 6093 / 1 Level/Stream : Sec 4 Express Duration : 1 hour Date : 28 August 2024 Setter : Ms Jane Zhou Additional material: Multiple Choice Answer Sheet ▪ Section B: Answer one question. ▪ You are advised to spend no longer than 50 minutes on Section A. INFORMATION FOR CANDIDATES The number of marks of each part-question is shown in brackets. This question paper consists of 22 printed pages including this cover page. Name: …………………………………………… ( ) Class: Sec ……………… READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and class on the Multiple Choice Answer Sheet. There are forty questions in this question 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 soft pencil on the Multiple Choice Answer Sheet. Read the instructions on the Multiple Choice 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 in this booklet. The use of an approved scientific calculator is expected, where appropriate.

2 SGSS/BIOP1/4EPrelim/2024 1 Which of the following structures has both cytoplasm and cell wall? A root hair cell B xylem vessel C red blood cell D platelet 2 Which structures listed below are found in both a typical animal cell and a typical plant cell? 1 centrioles 2 chloroplast 3 Golgi apparatus 4 mitochondria 5 ribosome A 3 and 5 B 1, 2 and 3 C 2, 3 and 4 D 3, 4 and 5

3 SGSS/BIOP1/4EPrelim/2024 3 Membranes within and at the surface of cells have different roles. Which of the outcomes correctly identifies the organelles that possess the membrane and function concerned? outcome 1 outcome 3 outcome 4 outcome 6 A chloroplast smooth ER rough ER mitochondrion B nucleolus vesicle smooth ER mitochondrion C nucleus vesicle smooth ER chloroplast D nucleus mitochondrion rough ER chloroplast membrane encloses cell contents cell surface membrane encloses a structure within the cell possesses pores no pores present single membrane double membrane allows exit of mRNA 1 protein synthesis 2 transports enzymes 3 lipid synthesis 4 allows oxygen to enter 5 allows carbon dioxide to enter 6

4 SGSS/BIOP1/4EPrelim/2024 4 The table below shows the outcome of an investigation on the uptake of bromide ions by a plant. Time from the start of experiment / min Amount of bromide ions taken up by plant tissue under the following conditions / arbitrary units Sugar absent, oxygen present Sugar present, oxygen absent Sugar and oxygen present 0 0 0 0 30 0 30 100 60 0 50 150 90 0 70 180 120 0 70 200 Which conclusion can be made from the investigation? A The uptake of bromide ions is via active transport only. B The uptake of bromide ions is via diffusion only. C The uptake of bromide ions occurs during aerobic respiration only. D The uptake of bromide ions is highest during aerobic respiration. 5 Bromothymol blue is a blue indicator that turns yellow when pH decreases below pH 6. A dish was filled with agar jelly containing adipose tissue extracts. Four holes were cut in the jelly and each hole was filled with the substances shown in the diagram. After 30 minutes, bromothymol blue was poured over the jelly. Which hole would be surrounded by the largest yellow region? pancreatic juice bile amylase with sodium hydroxide amylase A B C C D D

5 SGSS/BIOP1/4EPrelim/2024 6 The diagram below shows the breakdown of three types of organic molecules, X, Y and Z. X Y Z What are the identities of X, Y and Z? X Y Z A carbohydrate fat protein B carbohydrate protein fat C protein carbohydrate fat D protein fat carbohydrate 7 Five disaccharides were each hydrolysed with dilute acid and the purified products were separated by chromatography. Substances of the same identity will travel equal distances from the start line. The results are shown in the diagram. sucrose 1 2 3 4 Which result represents the hydrolysis of maltose? result A 1 B 2 C 3 D 4 glucose fructose

6 SGSS/BIOP1/4EPrelim/2024 8 The following fluids were obtained from a healthy individual. 1 blood plasma 2 saliva 3 sweat 4 urine Which fluid(s) will produce a positive result with the biuret test? A 1 only B 1 and 2 C 2 and 3 D 3 and 4 9 The graph shows the energy changes in a chemical reaction, with and without an enzyme. Which interval, A, B, C or D, represents the activation energy of the enzyme-catalysed reaction? B b reactants products reaction energy

7 SGSS/BIOP1/4EPrelim/2024 10 The diagram represents the ‘lock and key’ mechanism of an enzyme that works best at pH 7. enzyme substrate What of the following shows the enzyme and its substrate at pH 13? enzyme substrate A B C D

8 SGSS/BIOP1/4EPrelim/2024 11 The diagram below represents a sequence of reactions in a bacterium, where amino acids (1 to 6) essential for survival are produced by specific enzymes (V to Z). The original strain of the bacterium required only amino acid 1 and could produce all the other amino acids using the enzymes. A mutant strain of this bacterium could not synthesise some enzymes. It could only survive when provided with amino acids 1, 2 and 5. Which enzymes were missing in the mutant strain? A X and X only B V and Z only C V, X and Z D V, W and Z 12 The alimentary canal is made of muscles. How do the muscles, especially those in the walls of the oesophagus, act when pushing a bolus of food along? longitudinal muscles behind bolus circular muscles behind bolus A contract contract B contract relax C relax relax D relax contract

9 SGSS/BIOP1/4EPrelim/2024 13 The diagram shows the human alimentary canal. If structure 1 is removed, which statement correctly describes the consequence? A Fatty food cannot be digested. B More fats can be absorbed. C Oil cannot be emulsified. D Release of bile cannot be regulated. 14 The diagram shows the label from a bottle of gin. What will happen, during the next few hours, after a person drinks a large amount of gin? A Their judgment of distance will improve. B Their muscle control will be reduced. C Their reaction time will decrease. D Their urine output will decrease. 1 2 3 4

10 SGSS/BIOP1/4EPrelim/2024 15 The diagram illustrates changes in air pressure taking place inside the lungs during a complete cycle of breathing. Atmospheric pressure is 101 kPa. At which point in the diagram are ribs going to be lowered? 16 The graph shows the energy released by two animals through respiration as the external temperature changes. Which conclusion can be drawn from the graph? A Animals 1 and 2 release the least energy at 23 ° C. B Animal 2 always respires faster than animal 1. C As the temperature rises, respiration always increases. D The rate of respiration is the same for both animals at 23 ° C. A C B D pressure in lungs / kPa time rate of energy released /arbitrary units external temperature /° C animal 1 animal 2 0 10 20 30 40 50 60 20 15 10 5 0