Plastids · Botany

What is the primary role of RuBisCO in the chloroplast?

  1. To split water molecules
  2. To synthesize ATP
  3. To transport sucrose to the phloem
  4. To fix atmospheric Carbon Dioxide
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Correct answer: To fix atmospheric Carbon Dioxide

RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is the enzyme that incorporates CO2 into an organic molecule. It is arguably the most abundant protein on Earth and is found in the stroma.

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