Which of the following groups correctly lists hormones that are synthesized from amino acid precursors?

• A Cortisol, aldosterone, testosterone
• B Insulin, glucagon, somatostatin
• C Epinephrine, triiodothyronine, melatonin ✓
• D Erythropoietin, leptin, parathyroid hormone

Explanation

Epinephrine derives from tyrosine via catecholamine synthesis, triiodothyronine from iodinated tyrosine residues in thyroglobulin, and melatonin from tryptophan through serotonin, making all three amino acid derivatives. Option B lists peptide hormones of pancreatic origin, option A lists steroid hormones derived from cholesterol, and option D lists larger peptide and protein hormones. Indian exam convention classifies catecholamines and thyroid hormones firmly within amine hormones, distinct from both peptides and steroids.

Reference: Harper's Illustrated Biochemistry, 31st ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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