Light independent stage

Cards (12)

  • The light independent stage is called the calvin cycle
  • the light independent reaction happens in the Stroma, it is a series of reduction reactions
  • the calvin cycle continues until the NADPH, ATP or CO2 is used up.
  • the molecules involved:
    Ribulose bisphosphate (5C)
    carbon dioxide (1C)
    glycerate 3 phosphate (3C)
    triose phosphate (3C)
  • enzyme = RuBisCo
  • aim of the light independent stage is to reduce CO2 to glucose
  • the substances needed for the Light independent stage:
    • NADPH , ATP, CO2 , Ribulose Bisphosphate (RuBP), RuBisCo
    The substances produced:
    • NADP , ADP , Pi, glucose
  • Carbon dioxide (1C) is added to ribulose bisphosphate (5C) catalysed by the enzyme RuBisCo.
    A highly unstable 6C molecule is produced which immediately splits into two glycerate-3-phosphate (3C)
  • the two glycerate-3-phosphate molecules are reduced to produce two triose phosphate molecules.
    to allow this reduction reaction NADPH is oxidised and ATP is hydrolysed
  • the two triose phosphate molecules are used to make glucose and resynthesise Ribulose bisphosphate. the resynthesis of Ribulose bisphosphate requires the hydrolysis of ATP.
  • five out of six turns of the Calvin cycle resynthesise Ribulose bisphosphate.
    one out of six turns of the Calvin cycle form glucose
  • Glycerate-3-phosphate can be written as (GP)
    triose phosphate can be written as (TP)
    ribulose bisphosphate can be written as (RuBP)