NYGH 2011-S3EOY-Bio P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2011 Secondary Three BIOLOGY 45 minutes Paper 1 Multiple Choice 0800 - 0845 Friday 14 October 2011 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Multiple Choice Answer Sheet provided. There are thirty questions in 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 soft pencil on the answer sheet. INFORMATION FOR CANDIDATES 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. Setter: ST, WLF & CL This document consists of 13 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2011 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School 1 Which instrument led to the discovery and early study of cells? A Potometer B Centrifuge C Light microscope D Electron microscope 2 The photo shows a laboratory apparatus. (Photo taken by STan 9 Jul 2010) What is the laboratory technique that uses this apparatus? A Staining B Centrifugation C Bacteria culture D Gel electrophoresis 3 The photo shows a particular view of a living plankton. (Photo taken by pennstatelive 2 Sep 2010 Flickr Creative Commons-licensed content) What is the laboratory tool that is used by biologist to view this living plankton? A Stethoscope B Light microscope C Scanning electron microscope D Transmission electron microscope Setter: ST, WLF & CL Biology / I

2011 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School 4 What makes the phospholipid molecules in cell membranes form fluid bilayers? A The hydrocarbon tails repel water. B The polar heads repel each other. C The hydrocarbon tails are attracted to water. D The polar heads are attracted to the hydrocarbon tails. Questions 5 and 6 refer to the photomicrograph which shows part of a cell with a magnification of 49 000 times. Organelles Z are related to organelles Y. (Permission obtained from The Rockefeller University for 2010 Summer Outreach Programme) 5 What is organelle X? A Nucleus B Chloroplast C Mitochondrion D Endoplasmic reticulum 6 How is organelle Y related to organelle Z? A Y transport proteins made by Z. B Z transport proteins made by Y. C Y modifies proteins made by Z by adding carbohydrate. D Z modifies proteins made by Y by adding carbohydrate. Setter: ST, WLF & CL Biology / I [Turn over

2011 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School 7 Four identical samples of plant tissue, each with a water potential of -700 kPa, are placed in four different solutions. Which solution caused full plasmolysis to occur? A Solution with water potential -200 kPa. B Solution with water potential -400 kPa. C Solution with water potential -700 kPa. D Solution with water potential -1000 kPa. 8 The diagram shows the pathway of facilitated diffusion of a particle through a cell membrane. What are the most likely properties of the particle? Lipid solubility Electrically charged A High Yes B High No C Low Yes D Low No 9 A fungal amylase was incubated with starch at 22°C at pH 8. A sample of the starch was removed after five minutes and mixed with iodine solution. The mixture remained brown. What is the most likely conclusion for this observation? A An inhibitor of the fungal amylase was present. B The starch had been completely hydrolysed to maltose. C The pH was too high to allow the reaction to proceed quickly. D The optimum temperature for fungal amylase was less than 22°C. Setter: ST, WLF & CL Biology / I

2011 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School 10 A student was asked to identify the two compounds in each of three test tubes. The table shows the results of the student’s tests. Test tube Reagent added to test tube Sodium hydroxide solution + copper sulphate solution Benedict’s solution Iodine solution X Purple Brick red Brown Y Purple Blue Blue black Z Purple Blue Blue black Which conclusion is consistent with the results? A Egg white and sucrose had been placed in tube X. B Maltose and starch had been placed in tube Z. C Maltose and sucrose had been placed in tube X. D Starch and egg white had been placed in tube Y. Questions 11 and 12 refer to the graph which shows the effect of increasing temperature on activity of an amylase from the bacterium Pyrococcus furiosus. This bacterium is found in hot water associated with volcanic activity. Rate of reaction / arbitrary units Temperature / °C 11 Which statement explains the shape of the graph above 100°C? A The activation energy is too low. B The activation energy is exceeded. C The enzyme-substrate complex does not separate. D The shape of the active site of the enzyme is altered. Setter: ST, WLF & CL Biology / I [Turn over

2011 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School 12 Which statement explains how amylase in the bacterium Pyrococcus furiosus can work at temperatures as high as 100°C? A Amylase in the bacterium has more bonds. B Amylase in the bacterium has more than one active site. C Amylase in the bacterium has optimum temperature at 80°C. D Amylase in the bacterium has optimum pH at around pH5 to pH6. 13 What are the substrates and end products for the action of the enzyme trypsin? Substrates End products A Fats Fatty acids and glycerol B Fats Fatty acids and glucagon C Proteins Amino acids D Proteins Polypeptides 14 The figure shows a transverse section of an intestinal villus. What is the main food substance that is absorbed into structure 1? A Amino acids B Fatty acids C Glucose D Ions Setter: ST, WLF & CL Biology / I

2011 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School 15 The diagram illustrates how a food bolus is moved during peristalsis. Which of the following correct ly identifies and describes t he action of the muscles at Q to bring about the movement of the bolus as shown from 1 to 2? Muscles at Q Action of Q A Circular muscles Relaxed B Circular muscles Contracted C Longitudinal muscles Relaxed D Longitudinal muscles Contracted Questions 16, 17 and 18, refer to the diagram which shows part of the alimentary canal of a mammal. P Q R T U S Setter: ST, WLF & CL Biology / I [Turn over

2011 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School 16 Which structure(s) is/are involved in the emulsification of fats? A P only B Q only C P and Q only D P, Q and R 17 Which structure produces substances to regulate the level of glucose in the blood? A P B Q C R D T 18 U is an enlarged, functional structure found in plant eating mamma ls. It contains bacteria that release the enzyme cellula se for the hydrolysis of cellulose. The role of S is in the absorption of water and dissolved mineral salts. What is structure U? A Appendix B Caecum C Colon D Ileu