The lipids are fatty acids, steroids and phospholipids.
Lipids (Eg: fats and oils) are the esters of moderate to long chain fatty acids, they are hydrophobic in nature. The monomers of lipids are glycerol and fatty acids.
Lipids are the naturally occurring organic compounds, which are of different types (Eg: fats, oils, steroids, waxes, phospholipids, terpenes, etc.). All the lipids share the common property of their solubility, i.e., they are insoluble in water and soluble in nonpolar organic solvents like acetone and benzene.
Biological importance:
Lipids are the structural elements of plasma membrane and nervous tissue. Adipose tissue (composed of lipids) act as an insulator of body and shock absorber. Lipids are essential for the synthesis of some of the hormones and the absorption of fat soluble vitamins (Vita A, D, E, K) needs lipids.
The food materials are metabolised to produce energy and if excess energy is produced than the required, it is stored in the form of lipids, proteins and glycogen. Biological macromolecules such as fats and oils are the primary long term energy storage molecules of the body. Unlike glycogen, lipids are stored in anhydrous form, so they cannot be excreted in the form of urine or sweat. The energy produced by the metabolism of lipids is greater than (9 calories per gram) the glycogen (four calories per gram).
Lipids are better known as fats, but what are they specifically?
fatty acids, phospholipids, steroids
Thus, the option (c) is incorrect.
Lipids are the naturally occurring organic compounds, which are of different types (Eg: fats, oils, steroids, waxes, phospholipids, terpenes, etc.). All the lipids share the common property of their solubility.
Therefore, the correct option are – A. fatty acids; B. phospholipids; C. steroids.