Nearly all macromolecules include the element carbon as a building block, because it is the only element that readily forms a giant chain or networks by bonding to other carbon atoms and other elements. Chemists can create macromolecules in labs. Most of the synthetic, or made in labs, macromolecules are polymers, which are large molecule built ups from smaller building block molecules, called monomers. On the other hand, living organisms build polymers and others complex macromolecules through natural process. Monomers of all classes of macromolecules form larger molecules by dehydration synthesis, a chemical reaction in which one monomer donates a hydroxyl and the other a hydrogen, thus forming a water molecule.

Lipids make up the most structurally heterogeneous class of macromolecules, but all share the property of being wholly or partly insoluble in water or they do not mix with water. They are very hydrocarbon like. Examples of lipids include fats, steroids and waxes. Fats are high-energy, compact storage molecules also know as triacylglycerols. There are two types of fatty acids, saturated , which are found mostly in animals and unsaturated which are found mostly in plants. Fats posses more energy per molecule and less hydration compared to carbohydrates, resulting in fats possessing much more energy stored per volume. They are also important as cushions for body organs and as an insulating layer beneath the skin. Examples of steroids are cholesterol, which functions in many ways. The common steroid structure is the basis of the human sex hormones.

erties depend on its size, it monomers, the strength of its bonds, and whether links form between different parts of the molecule. Synthetic polymers include the plastics polystyrene, polyester, nylon and polyvinyl chloride. S

Some topics in this essay:
MACROMOLECULES Macromolecules, RNA DNA, nucleic acids, proteins nucleic acids, proteins nucleic, synthetic polymers, living organisms, building block, storage molecules, organic compounds,