Testosterone, aldosterone and cortisol are all built from which precursor?

1. Testosterone from the gonads, and aldosterone and cortisol from the adrenal glands, are all steroids. 2. Steroid hormones are lipid derived, and their lipid of origin is cholesterol. 3. Tyrosine and tryptophan start amine hormones instead, which are a separate chemical class. 4. Thyroglobulin is the colloid glycoprotein that iodine attaches to inside thyroid follicles. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.2 Hormones_