Virtually all of the protein or amino acid-based hormones exert their effects through intracellular ________.

Virtually all of the protein or amino acid-based hormones exert their effects through intracellular ________.

Virtually all of the protein or amino acid-based hormones exert their effects through intracellular ________. 











A) ions
B) deactivators
C) nucleotides
D) second messengers













Answer: D