Question

. Blackening of urine when exposed to air is a
metabolic disorder in human beings. This is
due to
(A) Phenylalanine
(B) Thyrosine
(C) Valine replacing glutamine
(D) Glutamine repiacing valine​

Answer 1

Alkaptonuria is a rare inherited disorder. It occurs when your body can't produce enough of an enzyme called homogentisic dioxygenase (HGD). This enzyme is used to break down a toxic substance called homogentisic acid. ... People with alkaptonuria also have urine that turns dark brown or black when it's exposed to air.

Answer 2

Answer:

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