Peptide hormones act by
A) binding to water-soluble receptors in the cytoplasm.
B) interacting with DNA to promote transcription.
C) binding to surface receptors, and frequently interact with a G-linked protein to produce a second messenger within the cell.
D) producing sustained metabolic effects rather than rapid enzyme cascades.
E) binding to nuclear receptors to initiate gene transcription.

Question

Quizplus · Accepted Answer

Peptide hormones typically exert their effects by binding to receptors on the cell surface, not inside the cell. This interaction often involves a G-protein coupled receptor (GPCR) mechanism, leading to the production of second messengers (such as cAMP) within the cell, which then triggers a cascade of enzymatic reactions. This process is relatively rapid compared to mechanisms that involve changes in gene transcription.

Peptide Hormones Act by