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AQA_A-level_Biology_Paper_2 2021
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A-LEVEL BIOLOGY Practice Paper 2 1 A student investigated the rate of anaerobic respiration in yeast. She put 5 g of yeast into a glucose solution and placed this mixture in the apparatus shown in t... he figure below. She then recorded the total volume of gas collected every 10 minutes for 1 hour. (a)Explain why a layer of oil is required in this investigation. (b)The student’s results are shown in the following table (i) Calculate the rate of gas production in cm3 g–1 min–1 during the first 40 minutes of this investigation. Show your working. Answer = ____________________ cm3 g–1 min–1 (2) (ii) Suggest why the rate of gas production decreased between 50 and 60 minutes. [Show More]
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