AQA AS Level Biology Paper 2 Question Paper 7401-2 Oct 2021

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Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the... top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Show all your working. • Do all rough work in this book. Cross through any work you do not want to be marked. Information • The marks for the questions are shown in brackets. • The maximum mark for this paper is 75. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. AS BIOLOGY Paper 2 2 *02* IB/M/Jun21/7401/2 Do not write outside the Answer all questions in the spaces provided. box 0 1 . 1 The general structure of a fatty acid is RCOOH. Name the group represented by COOH. [1 mark] 0 1 . 2 Figure 1 shows the structure of a fatty acid R group. Figure 1 Name the type of R group shown in Figure 1. Explain your answer. [2 marks] Type of R group Explanation 0 1 . 3 Describe how you would test for the presence of a lipid in a liquid sample of food. [2 marks] 3 *03* Turn over ► IB/M/Jun21/7401/2 Do not write outside the box In 1935, scientists suggested a model for the chemical structure of a cell-surface membrane. Figure 2 shows the membrane structure the scientists suggested. Figure 2 0 1 . 4 Give one similarity and two differences between the membrane structure shown in Figure 2 and the fluid-mosaic model of membrane structure. [3 marks] Similarity Difference 1 Difference 2 Turn over for the next question 8 4 *04* IB/M/Jun21/7401/2 Do not write outside the box 0 2 . 1 Describe and explain one feature of the alveolar epithelium that makes the epithelium well adapted as a surface for gas exchange. Do not refer to surface area or moisture in your answer. [2 marks] 5 *05* Turn over ► IB/M/Jun21/7401/2 Do not write outside the Doctors measure box the health of lungs by calculating the FEV1:FVC ratio. • FEV1 is the maximum volume of air exhaled in one second. • FVC is the maximum volume of air exhaled in one breath. The minimum FEV1:FVC ratio of healthy lungs is 0.7:1 A man with the lung disease emphysema inflated his lungs fully. He then exhaled as much of this air as quickly as possible in one breath. Figure 3 shows how the volume of exhaled air chang [Show More]

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