DHS 2022 Y5 H2 Promo Paper 1 (QP)

© DHS 2022 9744/01 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Promotional Examination Year 5 H2 BIOLOGY 9744/01 Paper 1 Multiple Choice Questions 27 September 2022 Additional Materials: Multiple Choice Answer Sheet 30 minutes READ THESE INSTRUCTIONS FIRST: Write your class, index number and name at the top of this page. There are fifteen 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. 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. Write your name and class on the Multiple Choice Answer Sheet. Write and shade the Index Number as follows. This document consists of 12 printed pages. For illustration only: A student from class 5C41, with index number 01, should shade “4101”. 4 1 0 1

2 © DHS 2022 9744/01 1 The figure shows an E. coli engulfed by a basophil, a type of white blood cell. Ramzi S Cotran & Mortimer Litt, 1969 How is region P different from region Q? region P region Q A contains DNA loosely coiled around histone proteins contains DNA tightly coiled around histone proteins B is the site of RNA and polypeptide synthesis is the site of rRNA synthesis C is the site of ATP synthesis is the site of protein synthesis D has circular DNA has absence of DNA

3 © DHS 2022 9744/01 [Turn Over 2 The flow diagram shows a technique called cell fractionation used to separate cell organelles by their relative sizes. Cells are homogenised and mixed with buffer to prepare them for cell fractionation. The diagram shows the appearance of the homogenised cell mixture. Which organelle is found in sediment 3? A Nucleus B Mitochondria C Endoplasmic reticulum D Ribosome

4 © DHS 2022 9744/01 3 The figure shows the structure of s ophorose which is made up of two glucose monomers. Sigma-aldrich, 2022 Which of the following statements are correct? 1 It is a reducing sugar. 2 There is at least one beta glucose molecule present. 3 Polymerisation of sophorose forms cellulose. 4 The bond between the two monomers is a 1,6 glycosidic bond. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 4 Membrane fluidity affects membrane permeability. The more fluid a membrane is, the more permeable it is. Which of the following change in membrane structure increases the membrane permeability? A Increase in cholesterol level at low temperature B Decrease in cholesterol level at low temperature C Increase in hydrocarbon tail saturation level D Decrease in hydrocarbon tail unsaturation level

5 © DHS 2022 9744/01 [Turn Over 5 The figure shows the synthesis