AS BIOLOGY Paper 2. EXAM PREDICTIONS.. 100% EXAMINABLE

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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 In 1935, scientists suggested a model for the chemical structure of a cell-surface box 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 84 *04* IB/M/Jun21/7401/2 Do not write outside the 0 2 . 1 Describe and explain one feature of the alveolar epithelium that makes the epithelium box well adapted as a surface for gas exchange. Do not refer to surface area or moisture in your answer. [2 marks [Show More]

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