AP BIOLOGY

Detailed explanation-1: -Most lipid hormones are derived from cholesterol and thus are structurally similar to it, as illustrated in Figure 18.2. The primary class of lipid hormones in humans is the steroid hormones.

Detailed explanation-2: -Hormones are derived from amino acids or lipids. Amine hormones originate from the amino acids tryptophan or tyrosine. Larger amino acid hormones include peptides and protein hormones. Steroid hormones are derived from cholesterol.

Detailed explanation-3: -Lipid derived and phospholipid hormones These are hormones derived from fats or lipids such as linoleic acid, arachidonic acid and the phospholipids. The main class of lipid-derived hormone is the steroids which are derived from cholesterol and the eicosanoids.

Detailed explanation-4: -Chemically, hormones may be classified as either proteins or steroids. All of the hormones in the human body, except the sex hormones and those from the adrenal cortex, are proteins or protein derivatives.