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AQA Biology AS Past Paper Questions and Answers, Exams of Advanced Education

A collection of past paper questions and answers from the aqa (assessment and qualifications alliance) biology as-level exam. The questions cover a range of topics in biology, including water uptake and loss, the role of atp, testing for lipids, the structure and function of phospholipids, the properties of cholesterol in cell membranes, and the process of mitosis. Detailed explanations and answers to these questions, which could be useful for students preparing for the aqa biology as-level exam or reviewing key concepts in biology.

Typology: Exams

2024/2025

Available from 09/21/2024

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Download AQA Biology AS Past Paper Questions and Answers and more Exams Advanced Education in PDF only on Docsity! AQA Biology AS Past Paper Questions and answers water will affect the mass, only a measure of the water taken up or lost only is needed. - before reweighing, the student blotted dry the outside of each cylinder. explain why. to add phosphate to other substances and make them more reactive. to provide energy for other reactants. - give two ways in which the hydrolysis of ATP is used in cells. dissolve the piece of food in alcohol. then add water. white emulsion shows the presence of lipid. - Describe how you would test a piece of food for the presence of lipid. Glycerol - The figure below shows a phospholipid. The part of the phospholipid labelled A is formed from a particular molecule. Name this molecule. Ester - Name the type of bond between A and fatty acid X. Y because it contains a double bond between adjacent carbon atoms in hydrocarbon chain. - Which of the fatty acids, X or Y, in the figure above is unsaturated? Explain your answer. divide the mass of each lipid by the total mass of all the lipids in that type of cell. multiply answer by 100. - Scientists investigated the percentages of different types of lipid in plasma membranes from different types of cell. The table shows some of their results. The scientists expressed their results as Percentage of lipid in plasma membrane by mass. Explain how they would find these values. red blood cells are free to move in blood, they are not supported by other cells so cholesterol helps to maintain the shape. - Cholesterol increases the stability of plasma membranes. Cholesterol does this by making membranes less flexible.