Biochemistry Alkaptonuria is a metabolic disease caused by a defect in or lack of homogentisic acid oxidase which lead to A Absent patella B Blue sclera C Darkly pigmented sclera cornea & ear D Absent radii 💡 Explanation Alkaptonuria is a metabolic disease caused by a defect in or lack of homogentisic acid oxidase which lead to ✓ Correct Answer: C. Darkly pigmented sclera cornea & ear