2012_ RI_ H1 Bio P1 - RAFFLES INSTITUTION 2012 Year 6 Preliminary Examination Higher 1 BIOLOGY H 8875\/01 20th September 2012 Paper 1 Multiple Choice

2012_ RI_ H1 Bio P1 - RAFFLES INSTITUTION 2012 Year 6...

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H RAFFLES INSTITUTION 2012 Year 6 Preliminary Examination Higher 1 BIOLOGY 8875/01 Paper 1 Multiple Choice 20 th September 2012 1 hour Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in a soft pencil Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and shade your Index Number on the Answer Sheet in the spaces provided unless this has been done for you. 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 separate 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 in this booklet. Calculators may be used (Erase all mistakes completely. Do not bend or fold the OMR Answer Sheet). This document consists of 21 printed pages. © RI 2012 Preliminary Examination 8875/01 [Turn over Raffles Institution Internal Examination
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2 1. Four students, A , B , C , and D , who observed a root hair cell from a plant using an electron microscope, were asked to confirm the presence or absence within the cell of described cellular structures. Which student made the correct set of observations? Structure with a double membrane, inside which are stacks of flattened membranes Area near the nucleus containing a pair of structures that are composed of microtubules Structure with a double membrane with inner membrane infolded Network of tubular- shaped membranous sacs with no ribosomes visible on outer surface of membranes A x B x x C x D x x Key = present x = absent 2. Which one of the following sentences regarding the transport of substances across the membrane is true? A In diffusion, there will be no movement of particles across the membrane once dynamic equilibrium is reached. B Both diffusion and osmosis can occur in the presence of membranes and the absence of ATP. C In order for a cell to reach the same water potential as its surrounding solution, there must be no net gain or loss of water. D The sodium-potassium pump is a channel protein that is associated with the facilitated diffusion of sodium and potassium ions across the plasma membrane. © RI 2012 Preliminary Examination 8875/01 [Turn over
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3 3. The graphs show the activities of different enzymes 1 to 4 under different conditions. Which of the following statement is correct? A The kinetic energy of enzyme 2 and its substrate is fastest at 77˚C. B At 80˚C, several hydrogen bonds between the R groups of enzyme 2 are broken. C At pH 8, the substrate is bonded to the active site of enzyme 4 by hydrogen bonds only.
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