Q.16
Which one of the following is true for aromatic amino acid tyrosine?
- Tyrosine Biochemistry:
- L-Tyrosine is an aromatic amino acid synthesized from the essential amino acid phenylalanine via phenylalanine hydroxylase.
- Precursor of Thyroid Hormones:
- In thyroid follicles, tyrosine residues within the thyroglobulin protein are iodinated to form monoiodotyrosine (MIT) and diiodotyrosine (DIT).
- Coupling of these iodotyrosines yields the active thyroid hormones triiodothyronine ($T_3$) and thyroxine ($T_4$), which regulate basal metabolic rate and larval metamorphosis in fish.
- Tyrosine is also the precursor for catecholamines (dopamine, norepinephrine, epinephrine) and melanin pigment.
- nalysis:
- (Give rise to thyroid hormones): Correct.
- (Serves as precursor of choline): Incorrect (methionine/phosphatidylethanolamine are precursors of choline).
Correct option: (1) Give rise to thyroid hormones
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