The Basics of Molecules

In my biology class, we are learning about molecules and how they build up and break down. We are doing a web activity to study these concepts.
A macromolecule is a very large molecule that contain hundreds or thousands of atoms. A monomer has a low molecular weight and is capable of reacting with other monomers to form a polymer. Monomers are mainly sugars, amino acids, fatty acids, or nucleotides. A polymer has a high molecular weight and is derived mainly by the condensation of many smaller molecules. The four main types of macromolecules are: proteins, lipids, carbohydrates, and nucleic acid.
Macromolecules are formed when monomers come together to create larger chains of polymers. Monomers  join together through a condensation reaction where a covalent bond is formed between two monomers and also a water molecule is formed. Polymers are broken down by hydrolysis reaction. In hydrolysis reaction, the water molecule breaks the covalent bond that holds the two monomers together. The specific name for the bond between simple sugar monomers is called condensation reaction. The enzyme that joins monomers together is called a polymerase enzyme. Sugar is stored as glycogen in the human body as spirals and branches. Plant foods are essential to animal life because they contain many carbohydrates. The digestion of starch by animals starts in the mouth by chewing it mechanically and chemically breaking it down with saliva, in continues in the small intestine with pancreatic amylase.