Which of the following is incorrect matching of an amino acid and its functions ?

Options

A. `{:("Amino",,"Functions"),("Tyrosine",-,"Forms hormones thyroxine and adrenaline"):}`
B. `{:("Amino",,"Functions"),("Glycine",-,"Involved in the formation of heme"):}`
C. `{:("Amino",,"Functions"),("Tryptophan",-,"Involved in the formation of vitamin nicotinamide as
well as plant
hormone indole-3 acetic acid"):}`
D. `{:("Amino",,"Functions"),("Tryptophan",-,"Skin pigment melanin"):}`

Answer

To determine which of the following is an incorrect matching of an amino acid and its functions, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Option 1: Tyrosine forms hormones thyroxine and adrenaline.**
- Tyrosine is indeed an aromatic amino acid that serves as a precursor for the synthesis of the hormones thyroxine (produced by the thyroid gland) and adrenaline (also known as epinephrine, produced by the adrenal glands).
- **Conclusion:** This is a correct match.

2. **Option 2: Glycine involved in formation of heme.**
- Glycine is a simple amino acid that plays a crucial role in the biosynthesis of heme, which is a component of hemoglobin. It is one of the precursors needed for heme synthesis.
- **Conclusion:** This is a correct match.

3. **Option 3: Tryptophan involved in formation of vitamin nicotinamide as well as plant hormone indole-3-acetic acid.**
- Tryptophan is an aromatic amino acid that is involved in the synthesis of nicotinamide (a form of vitamin B3) in animals and also plays a role in the production of the plant hormone indole-3-acetic acid (IAA), which is an auxin.
- **Conclusion:** This is a correct match.

4. **Option 4: Tryptophan, skin pigment, melanin.**
- This statement is incorrect. Tryptophan is not involved in the synthesis of melanin. Instead, the precursor for melanin is tyrosine. Therefore, this option incorrectly associates tryptophan with melanin production.
- **Conclusion:** This is an incorrect match.

### Final Answer:
The incorrect matching of an amino acid and its function is **Tryptophan, skin pigment, melanin.**

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