When a protein or peptide hormone binds to receptors on the surface of a cell,
A) the hormone receptor complex moves into the cytoplasm.
B) the plasma membrane becomes depolarized.
C) a second messenger appears in the cytoplasm.
D) the cell becomes inactive.
E) the hormone is transported to the nucleus, where it alters the activity of the DNA.

Question

Quizplus · Accepted Answer

When a protein or peptide hormone binds to receptors on the surface of a cell, it triggers the activation of a second messenger system in the cytoplasm. This second messenger, such as cyclic AMP or calcium ions, then initiates a series of intracellular signaling events that eventually lead to a cellular response. The hormone receptor complex does not typically move into the cytoplasm or transport to the nucleus to alter DNA activity. The plasma membrane also does not become depolarized, as that is a process commonly observed in nerve cells. The cell may become activated or inactive depending on the specific hormone and its signaling pathway.

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