The body makes its own supply of this lipid, which has a ring structure and is part of every cell membrane.

If the statement is asking whether it is true or false, the answer is true. The body can make its own lipid because of the food that we eat and also because it is found in the body where it is located in the tissues and the cells. It does compose of ring structure as it has multiple rings which are considered essential and the lipids are considered to be a part of a cell membrane.