Teaching CSIR NET Mock Test Series Life Sciences System Physiology Plant Respiration and Photorespiration
Following are the steps involved in photorespiration, with several intermediate reactions:
A. Formation of 2-phosphoglycolate via oxygenation of ribulose-1,5-bisphosphate by Rubisco
B. Conversion of 2-phosphoglycolate to glycolate by 2-phosphoglycolate phosphatase
C. Oxidation of glycolate to glyoxylate in peroxisomes by glycolate oxidase
D. Transamination of glyoxylate to form glycine
E. Decarboxylation of glycine in mitochondria to form serine and release ammonia
F. Hydroxypyruvate formed from serine and reduction to glycerate
G. Glycerate reenters the Calvin cycle via phosphorylation by glycerate kinase
Which is the correct sequence of reaction steps in ascending order in the photorespiration pathway?
1
B → A → D → C → F → E → G
2
A → B → C → D → E → F → G
3
A → B → D → C → E → G → F
4
C → A → B → D → F → E → G