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What is the function of the enzyme rubisco?

A. It regenerates RuBP so that the Calvin cycle can continue.
B. It catalyzes the final step in the synthesis of glucose in the chloroplast.
C. It pumps protons into the thylakoid space.
D. It catalyzes the addition of carbon dioxide to RuBP.

Answer :

Final answer:

RuBisCO is an enzyme essential for photosynthesis that catalyzes the reaction between carbon dioxide (CO₂) and ribulose bisphosphate (RuBP). This process, known as carbon fixation, converts inorganic carbon into organic molecules. RuBisCO's critical function makes it one of the most abundant enzymes on the planet.


Explanation:

Function of the Enzyme RuBisCO

The enzyme RuBisCO (ribulose bisphosphate carboxylase/oxygenase) plays a crucial role in the process of photosynthesis.

Its primary function is to catalyze the addition of carbon dioxide (CO₂) to ribulose-1,5-bisphosphate (RuBP), leading to the formation of a six-carbon compound that quickly splits into two three-carbon compounds. This reaction marks the first step of the Calvin cycle and is essential for carbon fixation, which transforms inorganic CO₂ into usable organic forms.

RuBisCO is recognized as one of the most abundant enzymes on Earth due to this vital process that supports the establishment of the carbohydrate backbone in plants.


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