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प्रश्न
Why is the RuBisCo enzyme more appropriately called RUBP Carboxylase-Oxygenase and what important role does it play in photosynthesis?
उत्तर
RuBisCO enzyme has an affinity towards carbon dioxide as well as towards oxygen. But this binding is competitive. It has a considerable affinity towards carbon dioxide than towards oxygenation. It is the relative concentration of CO2 and O2 which affects the binding of RuBisCO to a particular molecule. Since it acts like carboxylase as well as like oxygenase; it is more appropriately called RUBP Carboxylase–Oxygenase.
Importance of RuBisCO: In C3 plants, RuBisCO bonds with CO2 to generate 3PGA. In C3 plants, some of the RuBisCO binds with O2 to produce phosphoglycerate and phosphoglycolate through a process called photorespiration. Photorespiration reduces carbon fixation in C3 plants.
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संबंधित प्रश्न
Even though a very few cells in a C4 plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?
Calvin cycle occurs in ______.
In calvin cycle, carboxylation of RuBP fixed CO2 in number of PGA molecules
The reaction that is responsible for the primary fixation of CO2 is catalysed by ______.
\[\ce{3CO2 + 9ATP + 6NADPH + Water -> glyceraldehyde 3 – phosphate + 9 ADP + 6 NADP+ + 8 Pi}\]
Analyze the above reaction and answer the following questions:
- How many molecules of ATP and NADPH are required to fix one molecule of CO2?
- Where in the chloroplast does this process occur?
What conditions enable Rubirco to function as an oxygenase? Explain the ensuing process.
Six turns of calvin cycle are required to generate one mole of glucose. Explain.
