The sharing of electrons in alcohol as an example, are much more losely bound; this is a common way that organic compounds are formed, and why organic reactions can proceed at lower temperatures, mediated by enzymes. No enzyme could break down NaCl alone to make pure sodium metal and chlorine gas.
Protein can be categorized into two types: complete and incomplete proteins. Proteins are made up of smaller units, called amino acids. Complete proteins contain all of the amino acids your body needs and include meat, fish, poultry, dairy, and soy products.
Protein Structure. 1  Proteins are macromolecules that play many functions in the cell. 2  They are used for support, storage, transport of other substances, defense against invaders, and catalytic enzymes. 3  This is just a brief overview of protein structure. Proteins are composed of repeating units called amino acids.