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AA 1/AQA-74012-QP AS BIOLOGY Paper 2

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  • AA 1
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  • University Of The People

Endopeptidases and exopeptidases are involved in the hydrolysis of proteins. Name the other type of enzyme required for the complete hydrolysis of proteins to amino acids. [1 mark] 0 1 . 2 Suggest and explain why the combined actions of endopeptidases and exopeptidases are more efficient than ...

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  • January 15, 2023
  • 24
  • 2022/2023
  • Other
  • Unknown

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  • AA 1

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*Jun1674012R01 * IB/M/Jun16/E4 7401/2R AS BIOLOGY Paper 2 Tuesday 7 June 2016 Afternoon Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a calculator, which you are expected to use where appropriate. 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. • All working must be shown. • Do all work in this book. Cross through any work you do not want to be marked. Information • The marks for 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 2 *02* IB/M/Jun16/E4 Do not write outside the box Answer all questions in the spaces provided. 0 1 . 1 Endopeptidases and exopeptidases are involved in the hydrolysis of proteins. Name the other type of enzyme required for the complete hydrolysis of proteins to amino acids. [1 mark] 0 1 . 2 Suggest and explain why the combined actions of endopeptidases and exopeptidases are more efficient than exopeptidases on their own. [2 marks] 3 *03* Turn over ► IB/M/Jun16/E4 Do not write outside the box 0 1 . 3 Figure 1 shows the co-transport mechanism for the absorption of amino acids into the blood by a cell lining the ileum. Figure 1 The addition of a respiratory inhibitor stops the absorption of amino acids. Use Figure 1 to explain why. [3 marks]

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