NYGH 2016-S3EOY-Bio P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2016 Secondary Three BIOLOGY Paper 1 Multiple Choice 45 minutes Monday 3 October 2016 0845 - 0930 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page. 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 shade your choice in pencil on the separate Answer Sheet. 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. Setter: STan&DNg This document consists of 16 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2016 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Biology / I 1 Which row correctly identifies the organelles? transports protein stores substances makes proteins releases energy A vacuole mitochondrion ribosome rough endoplasmic reticulum B vacuole rough endoplasmic reticulum ribosome mitochondrion C rough endoplasmic reticulum ribosome vacuole mitochondrion D rough endoplasmic reticulum vacuole ribosome mitochondrion 2 The diagram shows specialised plant cells. What is the purpose of increasing lignin deposit in xylem vessels from the left to the right? A Xylem vessels are dying hence more lignin is deposited. B Xylem vessels are getting bigger hence need more support. C Xylem vessels are getting older hence more lignin is deposited. D Xylem vessels are losing more water hence need more waterproofing. lignin

2016 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Biology / I [Turn over 3 Samples of fully turgid cells from a plant were placed in sucrose solutions of 0.4, 0,8 and 1.0 mol dm-3. The cells were left for one hour. The percentage of plasmolysed cells in each sample was recorded. The results are shown in the graph. percentage of plasmolysed cells / % Which row is true for all the cells in the sucrose concentration indicated after one hour? sucrose concentration in solution / mol dm-3 sucrose concentration inside all the cells / mol dm-3 A 0.4 0.4 B 0.4 0.8 C 0.8 0.8 D 0.8 1.0 4 The diagram shows how a human immunodeficiency virus enters a human cell. How is the virus transported across the cell membrane? A diffusion B endocytosis C exocytosis D facilitated diffusion 0 20 40 60 80 100 envelope protein coat viral RNA cell attachment and receptor binding 0.4 0.8 1.0 Sucrose concentration / mol dm -3 100 50 0 human cell

2016 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Biology / I 5 The graph shows the effect of temperature on an enzyme-catalysed reaction. Which statement best describes what is happening at temperature X °C? A The activation energy of the reaction has been raised to a maximum. B The kinetic energy of substrate molecules has reached a maximum. C The number of denatured enzyme molecules is at a minimum. D The number of enzyme-substrate complexes has reached a minimum. 6 Starch solution is mixed with fungal amylase at 22°C at pH 8. A sample is removed after five minutes and mixed with iodine solution. The mixture remained brown. What is the most likely explanation for this observation? A The fungal amylase is not able to hydrolyse starch. B The optimum temperature for fungal amylase is less than 22°C. C The pH is too high to allow the reaction to proceed quickly. D The starch has been completely hydrolysed to maltose. 7 Which statement about the primary structure of a protein is correct? A It is formed when amino acids link up in hydrolysis reactions. B It is hydrogen bonded. C It is made of carbon, hydrogen and oxygen only. D It is unique to that protein. rate of reaction X temperature / °C

2016 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Biology / I [Turn over 8 The diagram shows the structure of two lipid molecules, P and Q. O O || || H2C - O - C - hydrocarbon chain H2C - O - C - hydrocarbon chain O O || || HC - O - C - hydrocarbon chain HC - O - C - hydrocarbon chain O || H2C - O - C - hydrocarbon chain H2C - O - phosphate P Q Which statements are correct? 1 Both molecules are formed using glycerol. 2 Both molecules are formed by condensation reactions. 3 The hydrocarbon chains of molecule P are always from saturated fatty acids. A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 3 9 Two substances, X and Y, are analysed. The table shows the elements that each contains. carbon hydrogen oxygen nitrogen sulphur X + + + - - Y + + + + + key + = present in substance - = absent in substance Which row correctly shows what X and Y are? X Y A amino acid carbohydrate B carbohydrate fat C fat amino acid D fat carbohydrate

2016 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Biology / I 10 Which two regions of the light spectrum are most absorbed by chlorophyll during photosynthesis? A blue and red B green and red C violet and blue D violet and green 11 The diagram shows how one molecule of glucose is formed during photosynthesis. What is R? A carbon dioxide B nitrogen C oxygen D water light dependent stage light independent stage photolysis of water water hydrogen ions + oxygen enzyme-controlled reactions R glucose + water light energy chemical energy

2016 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Biology / I [Turn over 12 The photo shows a scanning electron micrograph of a transverse section of a leaf. Which tissue, A, B, C or D, contains the highest concentration of amino acids? (https://s-media-cache-ak0.pinimg.com/736x/06/f4/ce/06f4ced8fe1247332260c05d342cdbec.jpg) 13 The diagram shows an investigation on the effect of different concentrations of carbon dioxide on the rate of photosynthesis. Which is not a controlled variable in this investigation? A length of water plant B light intensity C mass of sodium hy