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Question

Alkaptonuria is result of inability of the system to convert amino acid

A
Alanine
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B
Tryptophan
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C
Lysine
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D
Phenylalanine
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Solution

The correct option is C Phenylalanine
Alkaptonuria is a genetic disorder which imparts inability to process the amino acids phenylalanine and tyrosine. Mutation in the HGD gene that codes for the enzyme homogentisate 1, 2-dioxygenase is the cause of this disorder. A person homozygous for mutated allele accumulates an intermediate substance called homogentisic acid in the blood and tissues. Thus, the correct answer is option "D".

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