Question : The yellow colour of urine is due to presence of
Option 1: Bile
Option 2: Lymph
Option 3: Cholesterol
Option 4: Urochrome
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Correct Answer: Urochrome
Solution : The correct answer is Urochrome
The yellow colour of urine is caused mostly by urochrome, a waste product produced by the breakdown of haemoglobin, the oxygen-carrying molecule in red blood cells. As red blood cells disintegrate, the heme in haemoglobin degrades into biliverdin (green), which is then transformed into bilirubin (yellow). Bilirubin is finally excreted by the liver as bile, which adds to the yellow colour of urine following excretion.
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