AP BIOLOGY

Detailed explanation-1: -A lipid is any of various organic compounds that are insoluble in water. They include fats, waxes, oils, hormones, and certain components of membranes and function as energy-storage molecules and chemical messengers.

Detailed explanation-2: -Major types include fats and oils, waxes, phospholipids, and steroids.

Detailed explanation-3: -Fats, oils, waxes, and sterols are collectively known as lipids. Like the carbohydrates, the true fats contain only carbon, hydrogen, and oxygen. The molecules of such a lipid are made up of a glycerol molecule with three fatty acid molecules attached to it. This kind of lipid is also called a triglyceride.

Detailed explanation-4: -Fats, oils, and waxes belong to the group of naturally occurring organic materials called lipids. Lipids are those constituents of plants or animals that are insoluble in water but soluble in other organic solvents.

Detailed explanation-5: -Each of the three long chains on the right represents a different fatty acid. From top to bottom, the fatty acids are palmitic acid, oleic acid, and alpha-linolenic acid. These fatty acids are shown in Figure 3.6. 2.