Q. What are the steroids? What are the few examples of steroids with a biological function?

Steroids are lipids based in an angular combination of four carbon rings, one ring made of five carbons and three of them made of six carbons in the extremity. The union of each ring to the adjoining ring is made by the sharing of two adjoining carbons belonging to both rings.

Bile salts, cholesterol, the sexual hormones estrogen, testosterone and progesterone, the corticosteroids and the pro-vitamin D are examples of steroids.