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Question
The reaction that is responsible for the primary fixation of CO2 is catalysed by ______.
Options
RuBP carboxylase
PEP carboxylase
RuBP carboxylase and PEP carboxylase
PGA synthase
Solution
The reaction that is responsible for the primary fixation of CO2 is catalysed by RuBP carboxylase and PEP carboxylase.
Explanation:
For C3 plants it is RuBP carboxylase and for C4 plants it is PEP carboxylase.
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RELATED QUESTIONS
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
\[\ce{3CO2 + 9ATP + 6NADPH + Water -> glyceraldehyde 3 – phosphate + 9 ADP + 6 NADP+ + 8 Pi}\]
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.
Why is the RuBisCo enzyme more appropriately called RUBP Carboxylase-Oxygenase and what important role does it play in photosynthesis?
