TKGS 2024 S4 Prelim Bio Paper 1

1 This document consists of 20 printed pages. TANJONG KATONG GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS 4 INDEX NUMBER BIOLOGY 6093/01 Paper 1 Multiple Choice 22 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, index number on the Answer Sheet. There are forty 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. The use of an approved scientific calculator is expected, where appropriate. Setter: Mr Lim Kok Siong Marker: Mr Lim Kok Siong

2 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 1 The diagram shows a cell viewed under an electron microscope. Which structure is responsible for the modification and packaging of substances for secretion out of the cell? 2 A unicellular organism containing sodium ions at a concentration of 0.1 mM lives in a pond of sodium concentration 0.01mM. How does the organism absorb sodium ions? A osmosis B diffusion C ingestion D active transport A B C D

3 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 3 The diagram shows an experiment setup to investigate osmosis. What will happen to the liquid levels in tube X and tube Y after 30 minutes? tube X tube Y A rise fall B fall rise C rise rise D fall fall 4 During deamination, which element is significantly removed from an amino acid molecule? A carbon B oxygen C nitrogen D hydrogen knot tube X tube Y glass beaker dialysis tubing 10% sucrose solution 5% sucrose solution knot dialysis tubing 15% sucrose solution

4 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 5 The graph shows two possible energy changes of an enzyme-controlled reaction. Which represents the activation energy of the reaction with and without the enzyme? with enzyme without enzyme A 1 + 2 1 B 1 2 C 1 + 3 2 + 3 D 1 2 – 1 substrate energy 1 2 product 3

5 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 6 The graph shows the rate of reaction of an enzyme under different pH. Which statement is correct? A The enzyme is inactive at pH 2. B The time taken for the reaction to complete is