medium · MCAT bio-biochem
Insulin is a peptide hormone synthesized in the pancreas. Given its chemical nature, which of the following best describes its mechanism of action on target cells?
- It diffuses through the plasma membrane and binds to an intracellular receptor.
- It acts as a ligand-gated ion channel to change the membrane potential.
- It enters the nucleus directly to act as a transcription factor.
- It binds to a transmembrane receptor, initiating a secondary messenger cascade.
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