Which of the following is NOT true of a peptide hormone?
A)It diffuses into the cell to cause cellular changes.
B)It binds to a receptor on the plasma membrane.
C)It activates a second messenger inside the cell that causes cellular changes.
D)Cyclic AMP is a common second messenger.

Question

Quizplus · Accepted Answer

Peptide hormones cannot diffuse into the cell because they are too large and polar to cross the lipid bilayer of the plasma membrane. Instead, they bind to a receptor on the plasma membrane, which initiates a signal transduction pathway that ultimately leads to cellular changes.

Which of the Following Is NOT True of a Peptide