question_answer

Glycolate cycle is meant for the metabolism a

A)  carbohydrates                

B)  amino acids

C)  proteins                             

D)  lipids

Correct Answer: A

Solution :

                 Glycolate pathway is meant of metabolism of carbohydrate. It involves the conversion of 2 molecules of phosphoglycolate to a molecule of serine and a molecule of \[C{{O}_{2}}\]. This pathway salvages the carbon from phosphoglycolate. It involves 3 cellular compartments, chloroplast, peroxisome and mitochondria.                         Glycolate formed by dephosphorylation of phosphoglycolate in chloroplast is transaminated to glycine in peroxisomes. In mitochondria, two glycine molecules condense to form serine and the \[C{{O}_{2}}\] is released during photorespiration. The serine thus formed is converted to hydroxypyruvate and then to glycerate in peroxisomes and glycerate re-enters the chloroplast to be phosphorylated, rejoining the Calvin cycle.