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Q.
Which of the following is maximum in chloroplast?
Bihar CECEBihar CECE 2005
Solution:
RuBP carboxylase (Rubisco) is the most abundant protein in chloroplasts and probably on earth. It catalyses the carboxylation of ribulose 1-5 biphosphate to form two molecules of 3 phosphoglyceric acid in $ {{C}_{3}} $ cycle of photosynthesis. Several types of protein kinase and phosphatases are located to specific subcellular regions. Protein phosphatase-1 (PP-1) is part of that regulatory mechanism it removes phosphates from P-Ser and P-Thr residues of glycogen synthase and phosphorylase kinase reversing the regulatory effect of c-AMP dependent protein kinase. Hexokinase enzyme catalyse the phosphorylation of glucose molecule in glycolysis. Like many other kinases it requires $ M{{g}^{2+}} $ for its activity. The enzymes that degrades DNA rather than synthesis are called nucleases. These may be exonuclease or endonuclease.