Photosynthesis and Chloroplasts
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Questions and Answers

What is the primary function of the thylakoid membranes in chloroplasts?

  • To catalyze the Calvin cycle reactions
  • To allow the diffusion of carbon dioxide into the chloroplast
  • To store ATP and NADPH produced during photosynthesis
  • To provide a site for the light reactions of photosynthesis (correct)

    • What is the overall chemical change that occurs during photosynthesis?

  • 6 CO2 + 6 H2O → C6H12O6 + 6 O2
  • 6 CO2 + 12 H2O + Light energy → C6H12O6 + 6 O2 (correct)
  • C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
  • 6 O2 + 12 H2O → C6H12O6 + 6 CO2

    • What is the role of chlorophyll in the light reactions of photosynthesis?

  • Chlorophyll acts as an electron acceptor, transferring electrons through the electron transport chain
  • Chlorophyll absorbs light energy and transfers it to the reaction centers of Photosystem I and Photosystem II (correct)
  • Chlorophyll splits water molecules, releasing hydrogen and oxygen as byproducts
  • Chlorophyll catalyzes the Calvin cycle reactions, converting CO2 into organic molecules

    • What is the purpose of the Calvin cycle in the overall process of photosynthesis?

    <p>To convert carbon dioxide into organic molecules, such as glucose</p> Signup and view all the answers

    What is the role of the electron transport chain in the light reactions of photosynthesis?

    <p>To transport electrons from the primary electron acceptor to Photosystem I</p> Signup and view all the answers

    What is the primary purpose of the electron transport chain in the light reactions of photosynthesis?

    <p>To reduce NADP+ to NADPH</p> Signup and view all the answers

    What is the purpose of the thylakoid space in the chloroplast?

    <p>To accumulate the hydrogen ions (H+) released during the splitting of water</p> Signup and view all the answers

    What is the role of the proton gradient created across the thylakoid membrane during the light reactions?

    <p>It drives the production of ATP through chemiosmosis</p> Signup and view all the answers

    Which of the following is a correct statement about the Calvin cycle?

    <p>It uses the energy of ATP and the reducing power of NADPH to reduce CO2 to sugar</p> Signup and view all the answers

    What is the purpose of the three phases of the Calvin cycle (carbon fixation, reduction, and regeneration of the CO2 acceptor)?

    <p>To convert CO2 into organic compounds and regenerate the starting material</p> Signup and view all the answers

    How many molecules of CO2 must be fixed in the Calvin cycle to produce one molecule of glyceraldehyde 3-phosphate (G3P)?

    <p>3</p> Signup and view all the answers

    What is the role of the enzyme rubisco in the Calvin cycle?

    <p>It catalyzes the fixation of CO2 to RuBP</p> Signup and view all the answers

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