easy · MCAT bio-biochem

A 22-year-old patient with Type 1 diabetes is prescribed exogenous insulin to manage blood glucose levels.

Which of the following correctly describes the chemical nature of insulin?

  1. A steroid hormone derived from cholesterol.
  2. A small nonpolar molecule that freely crosses cell membranes.
  3. A peptide hormone consisting of 51 amino acids.
  4. An amine hormone derived from a single tyrosine residue.

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