When a Catecholamine or Peptide Hormone Binds to Receptors on the Surface

Question

When a catecholamine or peptide hormone binds to receptors on the surface of a cell,
A) the cell membrane becomes less permeable.
B) a second messenger appears in the cytoplasm.
C) the cell becomes inactive.
D) the hormone is transported to the nucleus where it alters the activity of DNA.
E) None of the answers are correct.

Accepted Answer

When a catecholamine or peptide hormone binds to receptors on the surface of a cell, it triggers the activation of a second messenger system within the cytoplasm of the cell. This second messenger then initiates a series of intracellular signaling pathways that ultimately lead to the cellular response to the hormone.