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Calvin Cycle quiz

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  • Where does the Calvin Cycle occur within the chloroplast?
    The Calvin Cycle occurs in the stroma, the fluid-filled space inside the chloroplast.
  • What are the main reactants required for the Calvin Cycle?
    The main reactants are CO2, ATP, and NADPH.
  • What is the primary product of the Calvin Cycle?
    The primary product is glucose, a sugar molecule.
  • Which enzyme is responsible for carbon fixation in the Calvin Cycle?
    Rubisco is the enzyme that catalyzes carbon fixation by attaching CO2 to RuBP.
  • What is the first stable molecule produced during carbon fixation?
    The first stable molecule is phosphoglyceraldehyde (PGA), a 3-carbon compound.
  • Why is the Calvin Cycle pathway called the C3 pathway?
    It is called the C3 pathway because the first stable molecule produced is a 3-carbon compound.
  • What is the role of ATP and NADPH in the Calvin Cycle?
    ATP and NADPH provide energy and reducing power for the synthesis of G3P from PGA.
  • What molecule is synthesized from PGA in the second phase of the Calvin Cycle?
    Glyceraldehyde 3-phosphate (G3P) is synthesized from PGA.
  • How many G3P molecules are needed to make one glucose molecule?
    Two G3P molecules are needed to synthesize one glucose molecule.
  • What happens to leftover G3P molecules in the Calvin Cycle?
    Leftover G3P molecules are used to regenerate RuBP in the third phase.
  • What is the purpose of RuBP regeneration in the Calvin Cycle?
    RuBP regeneration allows the cycle to continue by reforming the starting molecule, RuBP.
  • How is ATP used in the RuBP regeneration phase?
    ATP powers the enzymatic reactions needed to regenerate RuBP from G3P.
  • How many CO2 molecules are required to produce one glucose molecule in the Calvin Cycle?
    Six CO2 molecules are required to produce one glucose molecule.
  • What mnemonic can help remember the reactants and product of the Calvin Cycle?
    The mnemonic 'Calvin's can of sugar' helps remember CO2, ATP, NADPH (reactants), and glucose (product).
  • What is the difference between the stroma and stomata in plant cells?
    The stroma is the fluid-filled space inside the chloroplast, while stomata are openings in leaves for gas exchange.