2025 VJC H2 Biology Prelim P1

VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION 2025 HIGHER 2 NAME : ……………………………………………………….………………. CT CLASS: ………………..……… BIOLOGY Paper 1 Multiple Choice 9744 / 01 22/09/2025 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 18 printed pages. [Turn over]

2 1 What is correct about the synthesis and release of the glycoprotein mucin in epithelial cells lining the intestines? 1 The protein is produced on free ribosomes and a carbohydrate chain is added in the Golgi body. 2 The glycoproteins are packed into vesicles in the Golgi body forming lysosomes. 3 Secretory vesicles containing the glycoprotein move from the Golgi body and fuse with the cell surface membrane. A 1, 2 and 3 B 1 and 3 only C 1 only D 3 only 2 Hydroxyproline is synthesised by addition of an – OH group to the R -group of the amino acid proline. Hydroxyproline is a major component of collagen and has an important role in increasing the stability of its structure. Which statement explains why the addition of an –OH group to proline could increase the stability of collagen? A It strengthens hydrogen bonding between R -groups of adjacent polypeptide chains, resulting in a tertiary structure that is more resistant to heat denaturation. B It increases the number of sites available for the formation of hydrogen bonds within the secondary structure of collagen, resulting in more stable alpha helices. C The –OH group changes proline’s ring shape, locking collagen into a stable triple helix conformation. D It strengthens the quaternary structure of collagen by increasing the number of sites for hydrogen bonding between R-groups of distantly separated amino acids within the same polypeptide chain. 3 Which statement about fatty acids is correct? A Fatty acids are amphoteric molecules because they have a polar –COOH group at one end and a long non-polar hydrocarbon chain. B All unsaturated fatty acids are polyunsaturated, meaning they have two or more C=C double bonds in their hydrocarbon chains. C The complete oxidation of fatty acids releases more energy per gram than the complete oxidation of polysaccharides because fatty acids are less reduced. D Fatty acids stored as components of f