Photosynthesis: Carbon Reactions Calvin Cycle
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Photosynthesis: Carbon Reactions Calvin Cycle

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Questions and Answers

Which phase of the Calvin cycle involves the formation of two molecules of 3-phosphoglycerate?

  • Carboxylation (correct)
  • Regeneration
  • Dark reactions
  • Reduction

    • What is the main purpose of the dark reactions in photosynthesis?

  • Produce NADPH
  • Produce molecular oxygen
  • Reduce CO2 to carbohydrate (correct)
  • Generate ATP

    • Which enzyme catalyzes the carboxylation of ribulose-1,5-bisphosphate in the Calvin cycle?

  • Cytochrome c oxidase
  • ATP synthase
  • Rubisco (correct)
  • NADPH reductase

    • What is the primary factor that directly regulates the stroma reactions in photosynthesis?

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

    How many stages are involved in the Calvin cycle?

    <p>Three stages</p> Signup and view all the answers

    What proportion of triose phosphate is typically used for sucrose or starch production in the Calvin cycle?

    <p>One-sixth</p> Signup and view all the answers

    What is the main reason why the forward reaction of the carboxylation of ribulose-1,5-bisphosphate is strongly favored?

    <p>Low concentration of CO2 in photosynthetic cells</p> Signup and view all the answers

    What enzyme represents up to 40% of the total soluble protein in most leaves?

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

    What regulates the Calvin cycle through light-dependent enzyme activation?

    <p>Ribulose-5-phosphate kinase</p> Signup and view all the answers

    What factor determines the balance between the Calvin cycle and the C2 oxidative photosynthetic carbon cycle?

    <p>The concentrations of the substrates CO2 and O2</p> Signup and view all the answers

    What is calculated to be about 4 mM within the chloroplast stroma?

    <p>Concentration of rubisco active sites</p> Signup and view all the answers

    What happens to the concentration of CO2 in a solution in equilibrium with air as the temperature increases?

    <p>Decreases more than O2</p> Signup and view all the answers

    How does the concentration ratio of CO2 to O2 change as the temperature rises?

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

    What effect does increasing temperatures have on photorespiration and photosynthesis?

    <p>Increases relative to photosynthesis</p> Signup and view all the answers

    What is the impact of rubisco's kinetic properties at higher temperatures?

    <p>Enhances relative increase in oxygenation</p> Signup and view all the answers

    Why is it difficult to measure the rate of photorespiration in intact cells?

    <p>Because it is concurrent with photosynthesis</p> Signup and view all the answers

    How much carbon entering the C2 oxidative photosynthetic carbon cycle is theoretically released as CO2?

    <p>One-fourth</p> Signup and view all the answers

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