Study

A-level Photosythesis

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  • What happens to GP in the Calvin cycle?
    It is reduced to TP using ATP and NADPH
  • What is the fate of most TP molecules?
    Regenerate RuBP
  • What is photolysis?
    Splitting of water using light energy
  • Which molecule accepts electrons at the end of the electron transport chain?
    NADP
  • What is the role of ATP in photosynthesis?
    Provides energy for the Calvin cycle
  • What happens to TP to form glucose?
    Two TP molecules combine to form one hexose sugar
  • What enzyme catalyses carbon fixation in the Calvin cycle?
    RuBisCO
  • What are the three limiting factors of photosynthesis?
    Light intensity, carbon dioxide concentration, temperature
  • Where does the Calvin cycle take place?
    Stroma
  • Which pigment is primarily responsible for absorbing light energy?,
    Chlorophyll a
  • What is the overall equation for photosynthesis?,
    6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
  • What are the products of the light-dependent reactions?
    ATP, reduced NADP (NADPH), and oxygen
  • What is the source of oxygen released during photosynthesis?
    Photolysis
  • What is the role of reduced NADP (NADPH)?
    Provides hydrogen/reducing power in the Calvin cycle
  • What molecule is formed when CO₂ combines with RuBP?
    GP (glycerate-3-phosphate)
  • What effect does increasing light intensity have on photosynthesis?
    Rate increases until another factor becomes limiting
  • What is the source of electrons in the light-dependent reactions?
    Photolysis of water
  • What is the role of RuBP in photosynthesis?
    CO₂ acceptor in the Calvin cycle
  • What is the fate of some TP molecules?
    Used to form glucose and other organic molecules
  • In which organelle does photosynthesis occur?,
    Chloroplast