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B
RuBP carboxylase
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C
Phosphatase
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D
Transketolase
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Solution
The correct option is B RuBP carboxylase The most abundant protein in nature is probably the chloroplast enzyme ribulose bisphosphate carboxylase/oxygenase (Fraction I protein). It is arguably the most important enzyme because it catalyses the carbon dioxide-fixing step in photosynthesis. The synthesis of this protein depends upon the interaction of nuclear genes with the genetic system located in the chloroplast and involves the transfer of polypeptides across the chloroplast envelope by a post-translational mechanism.