Detailed structure of the chloroplasts Outer Stacked thylakoids membrane Stroma forming grana Thylakoid Inner membranes membrane Stroma contains large amounts of the enzyme ribulose bisphosphate carboxylase(RubisCO) that convert Co2 to organic formDetailed structure of the chloroplasts Stroma contains large amounts of the enzyme ribulose bisphosphate carboxylase (RubisCO) that convert CO2 to organic form