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The mineral ion that acts as an activator for both RuBisCo and PEPcase enzyme is
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Magnesium.
Mg2+ is an activator for both ribulose bisphosphate carboxylaseoxygenase and phosphoenol pyruvate carboxylase, both of which are critical enzymes in photosynthetic carbon fixation; Zn2+ is an activator of alcohol dehydrogenase and Mo of nitrogenase during nitrogen metabolism. Cu is associated with certain enzymes involved in redox reactions
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