Enzyme RuBisCO acts as both a carboxylase and | vedclass

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(B) The enzyme $RuBisCO$ has an affinity for both $CO_2$ and $O_2$. In $C_3$ plants,$RuBisCO$ often binds with $O_2$ leading to photorespiration,which

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Kranz anatomy is present in $C_4$ plants.

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(B) The enzyme $RuBisCO$ has an affinity for both $CO_2$ and $O_2$. In $C_3$ plants,$RuBisCO$ often binds with $O_2$ leading to photorespiration,which reduces photosynthetic efficiency.In $C_4$ plants,the specialized $Kranz$ anatomy creates a mechanism to increase the concentration of $CO_2$ around the $RuBisCO$ enzyme.Specifically,the $C_4$ pathway (Hatch-Slack pathway) fixes $CO_2$ into a $4$-carbon compound in the mesophyll cells,which is then transported to the bundle sheath cells.In the bundle sheath cells,this compound is broken down to release $CO_2$,creating a high $CO_2$ concentration environment.This high concentration of $CO_2$ ensures that $RuBisCO$ functions primarily as a carboxylase rather than an oxygenase,thereby minimizing photorespiration and maximizing carboxylation.

Enzyme $RuBisCO$ acts as both a carboxylase and an oxygenase. Why is it said that $RuBisCO$ in $C_4$ plants performs more carboxylation?

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