Biology > QUESTION PAPER & MARK SCHEME > AQA AS BIOLOGY 7401/2 Paper 2 Question Paper + Mark scheme (Merged) GRADE A+ (All)

AQA AS BIOLOGY 7401/2 Paper 2 Question Paper + Mark scheme (Merged) GRADE A+

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AQA AS BIOLOGY 7401/2 Paper 2 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN217401201* IB/M/Jun21/E14 7401/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 ... 8 9 TOTAL Time allowed: 1 hour 30 minutes 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 box Answer all questions in the spaces provided. 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 [Show More]

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