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Cyclic vs. Non-Cyclic Photophosphorylation quiz

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  • What is photophosphorylation?
    Photophosphorylation is the process of phosphorylating ADP to ATP using the energy of sunlight during the light reactions of photosynthesis.
  • What are the two types of photophosphorylation pathways?
    The two types are non-cyclic photophosphorylation and cyclic photophosphorylation.
  • Which pathway produces both ATP and NADPH?
    Non-cyclic photophosphorylation produces both ATP and NADPH.
  • When does a cell use the non-cyclic photophosphorylation pathway?
    A cell uses non-cyclic photophosphorylation when it requires both ATP and NADPH.
  • What is the path of electrons in non-cyclic photophosphorylation?
    Electrons move in a linear path from photosystem II to photosystem I and finally to NADPH.
  • What is the main product of cyclic photophosphorylation?
    The main product of cyclic photophosphorylation is ATP.
  • Which photosystem is used in cyclic photophosphorylation?
    Cyclic photophosphorylation uses only photosystem I.
  • Does cyclic photophosphorylation produce NADPH?
    No, cyclic photophosphorylation does not produce NADPH.
  • How do electrons move in cyclic photophosphorylation?
    Electrons cycle from photosystem I back to the electron transport chain and then return to photosystem I.
  • What determines whether a cell uses cyclic or non-cyclic photophosphorylation?
    The cell's need for ATP and NADPH determines which pathway is used; both are made in non-cyclic, while only ATP is made in cyclic.
  • What is the role of the proton motive force in photophosphorylation?
    The proton motive force is used to generate ATP from ADP during both cyclic and non-cyclic photophosphorylation.
  • Where are the electrons ultimately transferred in non-cyclic photophosphorylation?
    In non-cyclic photophosphorylation, electrons are ultimately transferred to NADP+ to form NADPH.
  • What happens to the hydrogen ion gradient during photophosphorylation?
    A hydrogen ion gradient is built up in the thylakoid space, which drives ATP synthesis.
  • Can a cell switch between cyclic and non-cyclic photophosphorylation?
    Yes, a cell can switch between the two pathways depending on its energy and reducing power needs.
  • What is the main difference in electron flow between cyclic and non-cyclic photophosphorylation?
    Non-cyclic photophosphorylation has a linear electron flow, while cyclic photophosphorylation has a cyclic electron flow.