Question

multiple choice question
the first messenger peptide hormone:
o is often found as the compound camp
o binds to a receptor on the plasma membrane
o is formed within the cell

Explanation:

Peptide hormones are water - soluble and cannot cross the plasma membrane. They bind to specific receptors on the plasma membrane to initiate a signaling cascade. cAMP is often a second - messenger, not a first - messenger peptide hormone. First - messenger peptide hormones are extracellular and bind to plasma - membrane receptors, not formed within the cell.

Answer:

binds to a receptor on the plasma membrane