Answer :
Final answer:
The initial enzyme-catalyzed reaction in the Hatch–Slack pathway is represented by Option 1: CO₂ + RuBP → 3-PGA. So the correct option is option 1.
Explanation:
The Hatch–Slack pathway is a photosynthetic pathway that is used by some plants to increase carbon dioxide fixation. The pathway is named after the two scientists who discovered it, Marshall Davidson Hatch and Charles Raymond Slack.
The first step in the Hatch–Slack pathway is the fixation of carbon dioxide by the enzyme phosphoenolpyruvate carboxylase (PEPCase).
PEPCase catalyzes the reaction between carbon dioxide and phosphoenolpyruvate (PEP) to form oxaloacetic acid (OAA).
OAA is then transported to the bundle sheath cells, where it is decarboxylated to release carbon dioxide.
The released carbon dioxide is then fixed by the Calvin cycle, which is the second phase of photosynthesis.
Option 1: CO₂ + RuBP → 3-PGA represents the initial enzyme-catalyzed reaction in the Hatch–Slack pathway.
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