Final answer:
Steroid hormones, derived from cholesterol, consist of lipid-soluble hormones like estradiol and testosterone. The only lipid-soluble hormone in the amino acid-derived class is the thyroid hormone.
Step-by-step explanation:
The class of hormones that consists entirely of lipid-soluble hormones are the steroid hormones. These hormones are derived from cholesterol and include examples such as estradiol and testosterone. Steroid hormones, such as cortisol and aldosterone, are released by the adrenal glands and are carried by transport proteins in blood due to their insolubility in water.
The only hormone in the amino acid-derived class that is lipid soluble is the thyroid hormone. While most amino acid-derived hormones are water soluble, like epinephrine and norepinephrine, the thyroid hormone is unique in its lipid solubility, enabling it to diffuse through plasma membranes.