YIJC 2023 H2 9744 P1 ANS

1 @YIJC 9744/01/PE/2023 [Turn over YISHUN INNOVA JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CG INDEX NO BIOLOGY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 9744/01 18 September 2023 1 hour READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, glue or correction fluid/tape. Write your name, index no. and CG on this cover page and OTAS provided unless this has been done for you. 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 22 printed pages and 2 blank pages. ANSWERS

2 @YIJC 9744/01/PE/2023 [Turn over 1 Different processes occur in different organelles in a plant cell. 1 transcription of circular DNA 2 assembly of ribosomal subunits 3 breaking of covalent bonds by hydrolysis 4 polymerisation of monomers containing nitrogen Which processes occur in the following organelles? mitochondrion chloroplast nucleus A 1 1 3, 4 B 1, 3 1, 2 2, 4 C 2, 3, 4 2, 4 1, 2, 4 D 1, 3, 4 1, 3, 4 2, 3, 4 2 The diagrams show short sections of some common and modified polysaccharides. Which statement is correct? A 1 is found in cellulose as β-1,4-glycosidic bond is present. B 2 is found in amylopectin, which is a helical molecule found in starch. C 3 is found in cellulose, which is a linear unbranched chain of β-glucose monomers. D 4 is found in glycogen, which is made of chains of α-glucose linked by α-1,4-glycosidic bonds and α-1,6-glycosidic bonds at branch points.

3 @YIJC 9744/01/PE/2023 [Turn over 3 Molecule X is a lipid. Which row is correct for molecule X and a triglyceride? molecule X contains triglyceride contains A one unsaturated fatty acid saturated fatty acids B no ester bonds three ester bonds C one fatty acid three fatty acids D two fatty acids three fatty acids 4 Bread contains a mixture of polypeptides known as gluten. Two of the polypeptides found in gluten are glutenin and gliadin. Which statement describes the tertiary structure of a protein? A α-helical sections are found in glutenin and gliadin. B A large pro