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Blackening of exposed urine is a metabol...

Blackening of exposed urine is a metabolic disorder due to
(a) Phenylalanine
(b) Tyrosine
(c) Homogentisic acid
(d) Valine replacing glutamic acid

A

Phenylalanine

B

Tyrosine

C

Homogenticsic acid

D

Valine replacing gultamic acid

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the blackening of exposed urine as a metabolic disorder, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Condition**: The question asks about a metabolic disorder that causes the blackening of exposed urine. This suggests that a specific compound is involved in this process. 2. **Identifying the Compounds**: The options provided are: - (a) Phenylalanine - (b) Tyrosine - (c) Homogentisic acid - (d) Valine replacing glutamic acid 3. **Researching Each Option**: - **Phenylalanine**: This is an amino acid that can lead to phenylketonuria (PKU) if not metabolized properly, but it does not cause black urine. - **Tyrosine**: This is another amino acid that is a product of phenylalanine metabolism. It is not directly responsible for the blackening of urine. - **Homogentisic acid**: This is a product of tyrosine metabolism. Accumulation of homogentisic acid leads to a condition known as alkaptonuria, which is characterized by the darkening of urine upon exposure to air. - **Valine replacing glutamic acid**: This option refers to a specific mutation that can lead to sickle cell disease but is not related to urine discoloration. 4. **Conclusion**: Based on the analysis, the compound responsible for the blackening of exposed urine is **homogentisic acid**. Therefore, the correct answer is (c) Homogentisic acid. ### Final Answer: (c) Homogentisic acid ---
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