Question:
Which one of the following disorder shows symptoms of excess of phenylalanine in urine of humans?
Which one of the following disorder shows symptoms of excess of phenylalanine in urine of humans?
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A missing liver enzyme stops phenylalanine from being converted to tyrosine, so it is excreted in urine.
Updated On: Nov 12, 2026
- Albuminuria
- Gout arthritis
- Urinary tract infection
- Phenylketonuria
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Phenylalanine is an amino acid that the liver normally converts to tyrosine with the enzyme phenylalanine hydroxylase.
Step 2: Identify the disorder
When this enzyme is missing, phenylalanine and its products such as phenylpyruvic acid build up and pass into the urine.
This inborn error of metabolism is an autosomal recessive disorder called phenylketonuria.
Step 3: Why the other options fail
Albuminuria means protein in urine, gout is uric acid deposition in joints and a urinary tract infection is caused by microbes.
Final Answer:
The disorder is phenylketonuria. \[ \boxed{\text{(D) }\text{Phenylketonuria}} \]
Phenylalanine is an amino acid that the liver normally converts to tyrosine with the enzyme phenylalanine hydroxylase.
Step 2: Identify the disorder
When this enzyme is missing, phenylalanine and its products such as phenylpyruvic acid build up and pass into the urine.
This inborn error of metabolism is an autosomal recessive disorder called phenylketonuria.
Step 3: Why the other options fail
Albuminuria means protein in urine, gout is uric acid deposition in joints and a urinary tract infection is caused by microbes.
Final Answer:
The disorder is phenylketonuria. \[ \boxed{\text{(D) }\text{Phenylketonuria}} \]
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