A) low concentration of \[C{{O}_{2}}\]
B) high concentration of \[C{{O}_{2}}\]
C) low concentration of oxygen
D) absence of oxygen
Correct Answer: A
Solution :
Glycolate pathway takes place in low concentration of \[C{{O}_{3}}\] and high concentration of \[{{O}_{2}}\]. It is the pathway, by which phosphoglycolate is salvaged by conversion to serine and thus 3 phosphoglycerate, involves 3 cellular compartments. Glycolate formed by dephosphorylation of phosphoglycolate in chloroplasts is transmitted to glycine in peroxisome. In mitochondria, two glycine molecules condense to form serine and the \[C{{O}_{2}}\] released (photorespiration) This reaction is catalysed by glycine decarboxylase, an enzyme present at very levels in the mitochondria of \[{{C}_{3}}\] plants. The serine is converted to hydroxyl pyruvate and then to glycerate in peroxisomes and glycerate reenters the chloroplast to be phosphorylated, rejoining the Calvin cycle. \[{{O}_{2}}\]is consumed at 3 steps during photorespiration.
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