Thyroid hormone is classified as a steroid.

a. True

b. False

a. True

Explanation:

Hormones are signaling molecules that are produced by endocrine glands. The role of hormones is to control physiology or behavior. They can be classified into three categories:

Peptide hormones - derived from a chain of amino acids

Amino acid or fatty acid hormones - derived from an amino acid or lipids respectively

Steroids - derived from cholesterol

Thyroid hormones are considered steroids. They are produced by the thyroid gland and are responsible for regulating metabolism.