Alkaptonuria is a condition in which

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(C) Alkaptonuria is a rare genetic metabolic disorder caused by a deficiency of the enzyme homogentisate $1,2-$dioxygenase.This enzyme deficiency lead

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Excretion of homogentisic acid in urine

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(C) Alkaptonuria is a rare genetic metabolic disorder caused by a deficiency of the enzyme homogentisate $1,2-$dioxygenase.This enzyme deficiency leads to the accumulation of homogentisic acid in the body.Because the body cannot break down this acid,it is excreted through the kidneys into the urine.When exposed to air,the homogentisic acid in the urine oxidizes,turning the urine dark or black in color.

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