DHS Prelim P1 P2

Name Index No. Civics Group ____________________________________________________________________________ DUNMAN HIGH SCHOOL SENIOR HIGH 2009 PRELIMINARY EXAMINATION General Certificate of Education Advanced Level YEAR SIX H1 BIOLOGY (8875) BIOLOGY 8875 / 01 PAPER 1 Multiple Choice 25 September 09 (Friday) 1 hour Additional Materials: Multiple Choice Answer Sheet ____________________________________________________________________________ READ THESE INSTRUCTIONS FIRST. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, civics group and 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 the soft pencil on separate Answer Sheet [optical answer sheet (OTAS)] provided. 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. Do not open this booklet until you are told to do so. This question paper consists of 14 printed pages and 2 blank pages (including this cover page).

2 Section A: Multiple Choice Questions (30 marks) Answer all questions. 1 Which molecules, found in cell surface membranes, contribute to cell recognition? A cholesterol and glycolipids B cholesterol and phospholipids C glycolipids and glycoproteins D phospholipids and glycoproteins 2 Equal quantities of a 5% st arch solution were added to equa l quantities of different solutions. After 5 minutes at room temperature, th e solutions were tested with iodine in potassium iodide solution and the depth of colour was recorded using a colorimeter (with an arbitrary scale of 1 to 5, 5 being the darkest blue). The results are given in the table. solution colorimeter reading 1 saliva and dilute HCl 4 2 saliva and dilute NaHCO3 1 3 dilute HCl only 4 4 saliva at 100oC 5 5 saliva at 20oC 3 This experiment suggests that saliva contains a biologically active substance that __________. A hydrolyses starch in acid conditions B is denatured by hydrochloric acid C is promoted in its action by high temperatures D may be activated by hydrogencarbonate ions

3 3 Which of the following food samples r equires the largest amount of oxygen to oxidize it completely? A 1 g of amino acid B 1 g of fat C 1 g of monosaccharide D 1 g of polysaccharide 4 Which is the longest phase in the cell cycle of human liver cells? A prophase B anaphase C cytoplasmic cleavage D interphase 5 Down’s syndrome can exist in two forms. Classic Down’s syndrome affects all cells, while the mosaic form arises from the