Final answer:
Macromolecules are composed of monomers that join to form polymers through dehydration synthesis. The four main classes of macromolecules have their specific monomers, and triglycerides, which are lipids, are made from glycerol and fatty acids, not cholesterol.
Step-by-step explanation:
Macromolecules are large, complex structures that are fundamental to all living organisms. They are comprised of monomers, which are small, repeating units that bind together through covalent bonds to form polymers. This process involves dehydration synthesis reactions, where water is released as the monomers join. There are four major classes of biological macromolecules: proteins, carbohydrates, nucleic acids, and lipids. Each class of macromolecule is made up of a different type of monomer.
Proteins are formed from monomers called amino acids. Carbohydrates are built from monosaccharides like glucose. Nucleic acids are composed of nucleotides, and lipids are constructed from fatty acids and glycerol, except for steroids, which are composed of four fused carbon rings and are not constructed from fatty acid monomers. It is essential to note that triglycerides, a type of lipid, are formed from one glycerol molecule and three fatty acids, rather than cholesterol. Therefore, the statement that a triglyceride's monomer is cholesterol is incorrect.