NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Botany
- Chapter
- Photosynthesis in Higher Plants
NEET 2026 · Botany · Photosynthesis in Higher Plants
The enzyme required for carboxylation in the Calvin cycle is :
The enzyme required for carboxylation in the Calvin cycle is :
Options
- AHexokinase
- BPEP carboxylase
- CRuBP carboxylase – oxygenase
- DCarboxypeptidase
Correct answer
C. RuBP carboxylase – oxygenase
Step-by-step solution
The Calvin cycle is the primary pathway for carbon fixation in plants.
The first step of the Calvin cycle is carboxylation, where carbon dioxide is added to a five-carbon acceptor molecule, Ribulose-1,5-bisphosphate (RuBP).
This reaction is catalyzed by the enzyme Ribulose bisphosphate carboxylase-oxygenase, commonly known as RuBisCO.
Hexokinase is an enzyme involved in glycolysis.
PEP carboxylase is the primary carboxylating enzyme in the C4 pathway.
Carboxypeptidase is a proteolytic enzyme involved in digestion.
Answer: RuBP carboxylase – oxygenase
The first step of the Calvin cycle is carboxylation, where carbon dioxide is added to a five-carbon acceptor molecule, Ribulose-1,5-bisphosphate (RuBP).
This reaction is catalyzed by the enzyme Ribulose bisphosphate carboxylase-oxygenase, commonly known as RuBisCO.
Hexokinase is an enzyme involved in glycolysis.
PEP carboxylase is the primary carboxylating enzyme in the C4 pathway.
Carboxypeptidase is a proteolytic enzyme involved in digestion.
Answer: RuBP carboxylase – oxygenase