Most hormones fit into one of the following three categories:

Question

Quizplus · Accepted Answer

Hormones are typically classified into three groups based on their chemical structure: amino acid derivatives, peptides and proteins, or steroids. Amino acid derivatives are small molecules that are derived from amino acids, such as epinephrine and norepinephrine. Peptides and proteins are comprised of chains of amino acids, such as insulin and growth hormone. Steroids are lipids that are based on a four-ring structure and includes hormones such as progesterone, testosterone, and cortisol.

Most Hormones Fit into One of the Following Three Categories