What are the polar groups in cholesterol?

The polar groups in cholesterol are the hydroxyl group (-OH) at C-3 and the carbonyl group (C=O) at C-17. These groups allow cholesterol to interact with water and other polar molecules, which is important for its function in the body. Cholesterol is a waxy, fat-like substance that is found in all animal cells. It is an essential component of cell membranes, where it helps to maintain the proper fluidity and function of the membrane. Cholesterol is also a precursor to a number of other important molecules, including steroid hormones and vitamin D.