Which element is an activator for both RuBisCO and PEP carboxylase?
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Correct answer: Magnesium (Mg)
Mg²⁺ is the essential activator for the primary CO₂-fixing enzymes in photosynthesis — RuBisCO in C3 plants and PEP carboxylase in C4 plants. It is also vital for ribosomal structural integrity and enzyme activation.
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