DHS 2023 Y5 H2 Promo Paper 1

© DHS 2023 9744/01 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Promotional Examination Year 5 H2 BIOLOGY 9744/01 Paper 1 Multiple Choice Questions 26 September 2023 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 14 printed pages. For illustration only: A student from class 5C41, with index number 01, should shade “4101”. 4 1 0 1

2 © DHS 2023 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 Which statements are true for both region P and region Q? 1 Both contain DNA tightly coiled. 2 Both are the sites of RNA synthesis. 3 Both are the sites of ATP synthesis. 4 Both have circular DNA. A 1 and 2 B 2 and 3 C 3 and 4 D 1, 2 and 4

3 © DHS 2023 9744/01 [Turn Over 2 The flow diagram shows a technique called cell fractionation used to separate cell organelles by their relative size s. Cells are homogenised and mixed with buffer to prepare them for cell fractionation. The diagram shows the appearance of the homogenised cell mixture. Which organelles are found in liquid 1? A Nucleus B Mitochondria C Nucleus and endoplasmic reticulum D Mitochondria, endoplasmic reticulum, and ribosome

4 © DHS 2023 9744/01 3 Which statements about the differences between phospholipids and triglycerides are false? 1 Phospholipids have hydrophobic regions but triglycerides do not. 2 The fatty acids in a triglyceride are always saturated but the fatty acids in a phospholipid may be saturated or unsaturated. 3 Phospholipids contain phosphoester bonds but triglycerides do not. 4 Phospholipids are non-polar but triglycerides are polar. A 1 and 2 B 2 and 3 C 3 and 4 D 1, 2 and 4 4 Cellulose is a molecule responsible for providing mechanical support in plant cells. Some properties of cellulose are described as follows: 1 Alternate g lucose monomers are rotated, instead of residues being arranged in the same orientation. 2 Only one type of monomer is found in cellulose. 3 Cellulose is unable to interact well with water. 4 Numerous cellulose chains are bundled together via extens ive hydrogen bonds. Which properties a