TJC 2023 H2 BIO P1 QP

1 [Turn over TEMASEK JUNIOR COLLEGE 2023 JC2 PRELIMINARY EXAMINATION Higher 2 BIOLOGY 9744/01 Paper 1 Multiple Choice 15 September 2023 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, civics group and index number on the Multiple Choice Answer Sheet (MCAS). Write in soft pencil. Do NOT use staples, paper clips, glue or correction fluid. There are thirty 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 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. This document consists of 15 printed pages and 1 blank page.

2 1 Which statement regarding the cell theory is false? A All living organisms are made up of one or more cells. B All cells must contain either DNA or RNA. C The cell is the basic structural and functional unit of life. D All cells arise from pre-existing cells. 2 The graph shows how the rate of entry of glucose into a cell changes as the concentration of glucose outside the cell changes. What is the cause of the plateau at X? A All the carrier proteins are saturated with glucose. B The carrier proteins are denatured and no longer able to function. C The cell has used up its supply of ATP. D The concentrations of glucose inside and outside the cell are equal. rate of entry of glucose into the cell concentration of glucose outside the cell X

3 [Turn over 3 Diagrams 1, 2 and 3 show the structural formulae of three polysaccharides. What are the names of these polysaccharides? 1 2 3 A amylose cellulose glycogen B amylose glycogen cellulose C cellulose glycogen amylose D glycogen amylose cellulose 4 Which statements about phospholipids and triglycerides are correct? 1 They both contain ester bonds. 2 They both have three fatty acid chains per molecule. 3 They both may have saturated and unsaturated fatty acid chains. 4 They are both used only as storage molecules. A 1, 2 and 3 B 1 and 3 only C 2, 3 and 4 D 2 and 4 only

4 5 The four acids shown below form part of an enzyme-catalyzed sequence of reactions . The addition of malonic acid results in no change in the concentration of oxoglutaric acid, an accumulation of succinic acid, and a near absence of both fumaric acid and malic acid. Further addition of fumaric acid results in the formation of malic acid. What does this information indicate about malonic acid? A It is an inhibitor of enzyme 2. B It