MI 2023 J2 H2 BI Prelim P1 QP

Class Adm No Candidate Name: This question paper consists of 25 printed pages. [Turn over] 2023 End-of-Year Exam Pre-university 3 Biology Higher 2 9744/01 Paper 1 Multiple Choice 21 September 2023 1 hour Additional Materials: Optical Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, Adm No. and class on all the papers you hand in. There are thirty 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 wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate.

2 9744/01/PU3 H2 EOY/2023 1 A part of a cell is shown in the electron micrograph below. Which of the following correctly describes the labelled organelles? membrane-bound contains nucleic acids found in both animal and plant cells A 1, 4 1 2, 3, 4 B 1, 4 1, 2 1, 2, 4 C 1, 2, 3 2, 3 3, 4 D 1, 2, 4 1 1, 2, 3, 4

3 9744/01/PU3 H2 EOY/2023 [Turn over] 2 It is possible for a bacterium to synthesise a eukaryotic protein. This involves introducing a eukaryotic gene into the bacterial DNA. The eukaryotic gene is then expressed into protein by the bacterium. Which of the following explains why a bacterial cell can produce a eukaryotic protein but cannot produce a eukaryotic glycoprotein? A Bacteria do not have rough endoplasmic reticulum. B Bacteria do not have nuclear envelope. C Bacteria do not have mitochondria. D Bacteria do not have Golgi bodies. 3 Which of the following correctly describes starch, glycogen and cellulose? starch glycogen cellulose A Can be easily hydrolysed to release α-glucose monomers Angle of α-(1,4)-bonds and CH2OH side chains results in helical chains Made up of long linear chains due to 180o rotation of alternate β- glucose B Insoluble due to the –OH groups projecting into the interior of helices Made up of α-glucose monomers with (1,4)- glycosidic bonds resulting in highly branched chains Cellulose chains are organised into microfibrils and macrofibrils C Highly branched amylose due to α-(1,6)-glycosidic bonds Highly compacted molecule that serves as a good energy storage in animal cells Provides structural support and prevents cells from bursting when turgid D Highly compacted molecule that serves as a good energy storage in plant cells Made up of β-glucose units with (1,4)-glycosidic bonds resulting in highly branched chains High tensile strength is due to the accumulative strength of the covalent cross linkages between cellulose chains

4 9744/01/PU3 H2 EOY/2023 4 The table compares three molecules, X, Y and