Lecithin, a small molecular weight organic compound found in living tissues, is an example of:

Step-by-step solution

The correct answer is option (1). Some lipids have phosphorous and a phosphorylated organic compound in them. These are phospholipids. They are found in cell membrane. Lecithin is one example. Option (2) is incorrect as glycerides are another group of lipids in which both glycerol and fatty acids are present. Option (3) and (4) are incorrect as amino acids and carbohydrates are separate groups of biomolecules.