Now let us imply this to human body. Our body is composed of many chemical substances. But we are only interested in proteins.
Proteins consist of many protein fibers that are “the countries of earth”. The protein fibers in turn consist of many polypeptide chains. A single polypeptide is made of groups of building blocks. When a group of those building blocks is examined it is revealed that each of them has a basic unit that is the AMINO ACID. Amino acid is the” brick”, basic structural entity for proteins.