Q. Blackening of urine, when exposed to air is a metabolic disorder in human beings. This is due to
A) Phenylalanine
B) Tyrosine
C) Valine replacing glutamine
D) Homogentisic acid
Explanation
Alkaptonuria is a genetic disease. It is a metabolic disorder, in which patient excrete large amount of homogentisic acid in urine. Such urine turns black, when exposed to air.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.