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  • Following are certain statements regarding Rubisco, the predominant protein in plant leaves that catalyses the initial reaction of the Calvin-Benson cycle. P. During the oxygenase activit

Following are certain statements regarding Rubisco, the predominant protein in plant leaves that catalyses the initial reaction of the Calvin-Benson cycle.

P. During the oxygenase activity of Rubisco, O, is used as substrate to produce three-carbon molecule, 3-phosphoglycerate and two-carbon molecule, 2-phosphoglycolate.

Q. In red and brown algae, the large subunit of Rubisco is localised in the chloroplast while the small subunit is localised in the nucleus.

R. The bound sugar phosphates in Rubisco are specifically removed by an ATP dependent enzyme, Rubisco activase.

S. The active form of Rubisco catalyses carboxylation or oxygenation reactions in five steps

Which one of the following combinations of above statements is correct?

 

Option: 1

P, Q and R


Option: 2

P, Q and S


Option: 3

Q, Rand S


Option: 4

P, R and S


Answers (1)

best_answer

Rubisco activase is an enzyme that plays a crucial role in the activation and maintenance of Rubisco, the key enzyme involved in carbon fixation during photosynthesis. Rubisco activase helps to remove inhibitory sugar phosphates from the active site of Rubisco and allows Rubisco to bind with carbon dioxide for the photosynthetic process. However, Rubisco activase does not specifically remove bound sugar phosphates in Rubisco. Its main function is to promote the activation of Rubisco and prevent its inactivation by assisting in the removal of inhibitory compounds, such as ribulose-1,5-bisphosphate (RuBP) or other sugar phosphates.

Therefore, statement R is wrong. Hence, the correct answer is option 2. 

Posted by

Pankaj Sanodiya

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