Protein

Human body contains thousands of different proteins, and about 50% of the dry weight of your body consists of proteins. Proteins provide structural support (muscle, collagen), help organisms move (muscle), store and transport chemicals from one area to another (hemoglobin), regulate when certain chemical reactions will occur (hormones), and catalyze a host of chemical reactions (enzymes). All of these different functions and others are accomplished using this one class of compounds.