NEET 2019 Odisha · BiologyPrevious Year Question
In Hatch and Slack pathway, the primary CO2 acceptor is -
Answer: (C) Phosphoenol pyruvate. In the Hatch and Slack (C4) pathway, the primary CO2 acceptor is the 3-carbon molecule phosphoenolpyruvate (PEP) present in the mesophyll cells, where PEP carboxylase fixes CO2 to form the 4-carbon OAA.
- A.Oxaloacetic acid
- B.Phosphoglyceric acid
- C.Phosphoenol pyruvate✓
- D.Rubisco
Correct Answer
(C) Phosphoenol pyruvate
Solution & Explanation
In the Hatch and Slack (C4) pathway, the primary CO2 acceptor is the 3-carbon molecule phosphoenolpyruvate (PEP) present in the mesophyll cells, where PEP carboxylase fixes CO2 to form the 4-carbon OAA. OAA is the first stable product (not the acceptor), and RuBisCO is the C3 enzyme; hence the acceptor is PEP. NCERT: Class 11 Ch 11, p.146 [146:006]: "The primary CO2 acceptor is a 3-carbon molecule phosphoenol"
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