Question

the diagram shows the general structure of a lipid, which consists of two main parts. which part is circled? alcohol group fatty acid carboxyl group unsaturated lipid

Explanation:

A carboxyl group has the structure -COOH. In the diagram, the circled part shows a carbon double - bonded to an oxygen and single - bonded to an oxygen which is further bonded to a hydrogen, characteristic of a carboxyl group. Lipids are composed of a glycerol backbone and fatty acid chains, and the fatty acid has a carboxyl group at one end. An alcohol group has an -OH bonded to a carbon. A fatty acid is a long - chain hydrocarbon with a carboxyl group at one end, but the circled part is just the carboxyl group itself. An unsaturated lipid has double bonds in its fatty acid chains, which is not what the circled part represents.

Answer:

carboxyl group