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Photorespiration in Plant Metabolism
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Photorespiration in Plant Metabolism

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Questions and Answers

What is the direct cost incurred by photorespiration in terms of energy molecules?

  • One ATP and one NAD(P)H (correct)
  • One NADH and one FADH2
  • Three ATP and one NADPH
  • Two ATP

    • What is the main cause of the inefficiency of photosynthesis in C3 plants due to photorespiration?

  • Insufficient light availability
  • Excessive water loss through transpiration
  • Oxygenation of RuBP by RuBisCO (correct)
  • Inhibition of chlorophyll synthesis

    • Which organelles are involved in the complex network of enzyme reactions during photorespiration?

  • Chloroplasts, leaf peroxisomes, and mitochondria (correct)
  • Nucleus and vacuoles
  • Ribosomes and lysosomes
  • Golgi apparatus and endoplasmic reticulum

    • What is the ultimate fate of approximately 25% of the carbon fixed by photorespiration?

    <p>Re-released as CO2 and ammonia</p> Signup and view all the answers

    What is the technical definition of photorespiration?

    <p>The metabolic network which acts to rescue the products of the oxygenation reaction (phosphoglycolate)</p> Signup and view all the answers

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