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A-LevelBiologyPhotosynthesis9700/43 · May/June 2020 · Q68 Marks

Structures and compounds involved in the light dependent stage of photosynthesis are listed, A to J. A – thylakoid membrane B – starch grain C – chlorophyll a D – chlorophyll b E – water F – NADP G – electron H – proton I – ATP J – chloroplast envelope

  1. (a)Complete Table 6.1 by matching each description with one letter chosen from A to J to show the correct structure or compound. You may use each letter once, more than once or not at all. Table 6.1 description | letter ---|--- accessory pigment | location of ATP synthase | acts as reaction centre | transports hydrogen atoms | diffuses through ATP synthase | broken down in photolysis |[6]
  2. (b)(i)GP (PGA) and TP (triose phosphate) are intermediates of the Calvin cycle of the light independent stage. Some GP and TP are used for the synthesis of organic compounds. Name a polysaccharide synthesised as a result of TP production.[1]
  3. (b)(ii)Name the additional element that is required for the production of amino acids from Calvin cycle intermediates.[1]

Mark scheme

Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.

  1. [6] accessory pigment: D;
  2. location of ATP synthase: A;
  3. acts as reaction centre: C;
  4. transports hydrogen atoms: F;
  5. diffuses through ATP synthase: H;
  6. broken down in photolysis: E;
  7. [1] cellulose / starch;
  8. [1] nitrogen ;

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About this question

Topic
Photosynthesis, A-Level Biology (syllabus 9700). Structured question, 8 marks.
Source
A-Level Biology, May/June 2020 Paper 4 Variant 3, question 6.

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