Biology > QUESTION PAPER & MARK SCHEME > AQA A-level BIOLOGY 7402/2 Paper 2 Question Paper + Mark scheme (Merged) GRADE A+ (All)

AQA A-level BIOLOGY 7402/2 Paper 2 Question Paper + Mark scheme (Merged) GRADE A+

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AQA A-level BIOLOGY 7402/2 Paper 2 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN217402201* IB/H/Jun21/E14 7402/2 For Examiner’s Use Question Mark 1 2 3 4 5 ... 6 7 8 9 10 TOTAL Time allowed: 2 hours 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 91. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level BIOLOGY Paper 2 2 *02* IB/H/Jun21/7402/2 Do not write outside the box Answer all questions in the spaces provided. 0 1 . 1 Describe the process of glycolysis. [4 marks] 0 1 . 2 Malonate inhibits a reaction in the Krebs cycle. Explain why malonate would decrease the uptake of oxygen in a respiring cell. [2 marks] 6 3 *03* Turn over ► IB/H/Jun21/7402/2 Do not write outside the box 0 2 . 1 Explain how a resting potential is maintained across the axon membrane in a neurone. [3 marks] 0 2 . 2 Explain why the speed of transmission of impulses is faster along a myelinated axon than along a non-myelinated axon. [3 marks] Question 2 continues on the next page 4 *04* IB/H/Jun21/7402/2 Do not write outside the box 0 2 . 3 A scientist investigated the effect of inhibitors on neurones. She added a respiratory inhibitor to a neurone. The resting potential of the neurone changed from –70 mV to 0 mV. Explain why. [3 marks] [Show More]

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