The following figure represents the Hatch and | vedclass

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(C) In the Hatch and Slack pathway ($C_4$ cycle):$1$. In the mesophyll cells, $CO_2$ is fixed by $PEP$ to form a $C_4$ acid (e.g., oxaloacetate or mal

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$P: C_4 	ext{ acid}, Q: C_4 	ext{ acid}, R: C_3 	ext{ acid}, S: C_3 	ext{ acid}$

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(C) In the Hatch and Slack pathway ($C_4$ cycle):$1$. In the mesophyll cells, $CO_2$ is fixed by $PEP$ to form a $C_4$ acid (e.g., oxaloacetate or malate/aspartate), which is represented by $P$.$2$. This $C_4$ acid is transported to the bundle sheath cells, represented by $Q$.$3$. In the bundle sheath cells, decarboxylation occurs, releasing $CO_2$ for the Calvin cycle and leaving behind a $C_3$ acid (e.g., pyruvate), represented by $R$.$4$. This $C_3$ acid is transported back to the mesophyll cells, where it is converted back into $PEP$ (regeneration), represented by $S$.Therefore, $P$ is a $C_4$ acid, $Q$ is a $C_4$ acid, $R$ is a $C_3$ acid, and $S$ is a $C_3$ acid.

The following figure represents the Hatch and Slack pathway. Identify $P, Q, R$ and $S$.

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