The Rosetta Stone: Slide Show
Proteins are the fundamental, active biological units that make us all unique. All living things are composed primarily of proteins. Humans can make over 100,000 proteins. As seen on previous pages, each protein is composed of long chains of amino acids which are ordered by the codons of a gene. But a protein is a complex, three-dimensional molecule. The way these chains of amino acids fold into each other determines the activity and function of the resulting protein.