2020-Sec-4-Pure-Biology-SA2-Maris-Stella QP

Class/ Index Number / Centre Number/ ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR BIOLOGY 6093/01 Paper 1 Multiple Choice 28 August 2020 1 hour Additional Materials: Optical Test Answer Sheet (OTAS) – 1 sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class, index number, Centre number and ‘O’ Level index number on the Answer Sheet in the spaces provided. There are forty questions on 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 answer 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 question paper. The use of an approved scientific calculator is expected, where appropriate. The total number of marks for this paper is 40. At the end of the examination, hand in the following separately: (1) Optical Test Answer Sheet (OTAS) (2) Question Paper This document consists of 14 printed pages.

2 1 The endoplasmic reticulum (ER) comprises of interconnected sacs or tubules suspended in the cytosol, a liquid found inside the cell. It has the following characteristics: 1: comprised of mostly tubules 2: comprised of flattened membranous sacs 3: involved in the synthesis of steroid hormones, e.g. testosterone 4: involved in the transport of polypeptides Which of the characteristics describe rough ER and smooth ER? rough ER smooth ER A 1 & 3 2 & 4 B 1 & 4 2 & 3 C 2 & 3 1 & 4 D 2 & 4 1 & 3 2 A mixture of food gives the following results on testing: A lilac colour in the biuret test; A blue colour when heated with Benedict's solution; A yellow colour with iodine; A white emulsion with ethanol. What does the mixture contain? A fat and protein B protein and reducing sugar C reducing sugar and starch D starch and fat 3 The diagram shows three stages that occur during an enzyme-controlled reaction. Which of the following indicates the correct sequence in which the three stages would occur if the enzyme promotes the building-up of a complex molecule from simpler ones? A Y → X → Z B Y → Z → X C X → Y → Z D X → Z → Y

3 For Q4-5, refer to the following information. An experiment was performed to investigate the effect of the enzyme catalase on hydrogen peroxide. The reaction was as follows: 2H2O2 o 2H2O + O2 From the results of this investigation, the following graphs X and Y were obtained: 4 In graph X, when there is an increase in the catalase concentration, A the rate will be the same at the start but it will reach a higher plateau. B there will be an increase in the rate at the start and it will