For example, a protein is a polymer whose subunits are selected from a set of twenty or more amino acids, carbohydrates are formed from sugars known as monosaccharides, oligosaccharides, and polysaccharides, lipids are formed from fatty acids and glycerols, and nucleic acids are formed from nucleotides.
For example, a protein is made up of subunits selected from among twenty or more amino acids, carbohydrates consist of sugars like monosaccharides, oligosaccharides, and polysaccharides, lipids are derived from fatty acids and glycerols, and nucleic acids are composed of nucleotides.