2024 VJC H2 Bio P1 QP

1 VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION 2024 HIGHER 2 NAME : ……………………………………………………….………………. CT CLASS: ………………..……… BIOLOGY Paper 1 Multiple Choice 9744 / 01 20/09/2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and class on the Answer Sheet in the spaces provided. 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. 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 20 printed pages. [Turn over]

2 1 The diagram below shows an electron micrograph of a eukaryotic cell. Which of the following options shows the correct functions of the labelled structures? X Y Z A site of photophosphorylation involved in autolysis site of protein synthesis B site of oxidative phosphorylation involve in secretion of proteins site of glycolysis C site of photophosphorylation involve in rRNA synthesis site of glycolysis D site of oxidative phosphorylation involved in autophagy site of protein synthesis

3 2 The table shows the diameter of some atoms when they form bond s. atom single bond / nm double bond / nm H 0.060 - O 0.132 0.110 N 0.140 0.120 C 0.154 0.134 Using the table, the approximate length of an amino acid is estimated to be 0.7 nm. What would be the approximate length of a dipeptide formed using this amino acid? A 0.9 nm B 1.2 nm C 1.4 nm D 1.7 nm 3 Which row shows the chemical g roups present in the biological molecules listed? biological molecule presence of carboxyl (COOH) groups presence of two or more hydroxyl (OH) groups 1 amino acid yes no 2 β glucose no yes 3 glycerol no no 4 fatty acid yes no A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

4 4 The graph shows the activity of an enzyme at four different te mperatures, with all other conditions being constant. What conclusion can be drawn from the graph? A No enzyme denaturation occurs at temperatures below 40 oC. B The optimum temperature for the enzyme is 30 oC in all incubation times. C The V max of enzyme activity is reached after 36 hours at 50 oC. D There are more functional enzyme molecules after 48 hours at 2 0 oC than 40 oC. 5 The action of the enzyme hexokinase, which catalyses the phosp horylation of glucose, is shown below. Which statements describe the behaviour of this enzyme? 1 The action of the enzyme illustrates the ‘lock and key’