Discussion
In photorespiration, the release of CO2 occurs from............. :
Answer: D
The CO2 of photorespiration is released from glycine.
Rubisco's oxygenase reaction splits ribulose 1,5-bisphosphate into 3-phosphoglycerate and 2-phosphoglycolate in the chloroplast. Phosphoglycolate becomes glycolate, which is oxidised to glyoxylate in the peroxisome and converted to glycine. In the mitochondrion the glycine decarboxylase complex then converts two molecules of glycine into one serine, releasing CO2 and NH3.
Ribulose 1,5-bisphosphate, 2-phosphoglycolate and glyoxylate are earlier intermediates of the pathway; none of their conversions gives off CO2.
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