Which Statement Is Incorrect

Multiple Choice

Which statement is incorrect?

A) Peptides are synthesized by the endoplasmic reticulum-Golgi complex system.
B) Peptides circulate largely bound to plasma proteins.
C) Peptides bind to surface receptors of their target cells.
D) Peptides exert their effect largely by means of second-messenger systems.
E) Peptides are released by exocytosis upon appropriate stimulation.