What is carboxylation in photosynthesis?

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Ribulose biphosphate (RuBP), the 5 carbon compound is the primary acceptor of carbon dioxide in photosynthesis. The 6 molecules of RuBP reacts with 6 molecules carbon dioxide to produce 6 molecules of a 6 carbon compound, this is called carboxylation. This reaction is catalyzed by the enzyme Rubisco. The 6carbon compound produced as a result of carboxylation is highly unstable. This molecules then breakdown immediately to produce 12 molecules of 3-phosphoglyceric acid. The 3-phosphoglyceric acid (PGA) is the first stable compound formed in photosynthesis. It is a three carbon compound, so this cycle is known as the C3 cycle

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Carboxylation is the first phase in the C3 cycle or Calvin cycle. It is the fixation of carbon dioxide, in which a five carbon compound is RuBP accepts the carbon dioxide. As a result a six carbon compound is produced this is unstable. The carboxylation reaction is catalyzed by the enzyme Ribulose biphosphate carboxylase (Rubisco) and it is the most abundant protein on earth. Carboxylation can be defined as the reaction in which carbon dioxide reacts with RuBP to produce an unstable six carbon compound. This six carbon compound will immediately breakdown into two molecules of 3-phosphoglyceric acid (3-PGA). This is the first stable compound that is produced during the photosynthesis, so Calvin cycle also known as C3 cycle.

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