Which of the following is the most abundant protein in the whole of the biosphere?
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Correct answer: RuBisCO enzyme
Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) is the most abundant protein in the biosphere due to its central role in photosynthetic carbon fixation in plants and algae. Collagen is the most abundant protein in the animal world.
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