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.
Type of Protein. Proteins are made up of amino acids. There are a total of 20 different amino acids. Some of the amino acids can't be made by human body; they are called essential amino acids. It is important that we take enough and balanced essential amino acids. The foods that provide all of the essential amino acids are called complete protein sources.