File:Protein.png

Summary

Structure of Protein: Primary, Secondary, Tertiary, and Quaternary Protein Structures

Proteins are an important class of molecules found in all living cells. A protein is composed of one or more long chains of amino acids, the sequence of which corresponds to the DNA sequence of the gene that encodes it. Proteins play a variety of roles in the cell, including structural (cytoskeleton), mechanical (muscle), biochemical (enzymes), and cell signaling (hormones). Proteins are also an essential part of diet.

Copyright status:

This image is public domain because it was first published by the National Human Genome Research Institute. http://www.genome.gov/copyright.cfm

Source:

http://www.genome.gov/Glossary/index.cfm?id=169