OFFICIAL SUMMER 2025 PEARSON EDEXCEL Pearson Edexcel GCE Advanced Subsidary In Biology B (8BI0 01) Paper 1: Core Cellular Biology and Microbiology MERGED QUESTION PAPER + MARK SCHEME

OFFICIAL SUMMER 2025 PEARSON EDEXCEL Pearson Edexcel GCE Advanced Subsidary In Biology B (8BI0 01) Paper 1: Core Cellular Biology and Microbiology MERGED QUESTION PAPER + MARK SCHEME Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 Some carbohydrates are composed of three monosaccharides. These are called trisaccharides. Raffinose is a trisaccharide composed of glucose, galactose and fructose. (a) Complete the diagram to show the structure of an alpha glucose molecule. (2) CH 2OH C O C H C C C (b) Name the bond that joins monosaccharides together. (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . . . .. . . . . . (c) The three monosaccharides present in raffinose each have a molecular mass of 180. The relative atomic mass of the element hydrogen is 1 and the relative atomic mass of the element oxygen is 16. Calculate the molecular mass of raffinose. (1) Answer .. . . .. . . .. . . . .. . . .. . . .. . . .. . . .. . . . .. . . .. . . .. . . . .. . . .. . . .. . . .. . (Total for Question 1 = 4 marks) 2 ■■■■ DO NOT WRITE IN T