• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

Proteins are complex organic compounds consisting mainly of amino acids joined together by peptide bonds in long chains. These are comparatively large and complicated molecules and their full functions have not been completely established. Proteins are essential to the central chemical processes of life and are of great nutritional value. They are specific to different species and also vary according to different organs and locations within a particular living creature. The functions of proteins range from structural support, forming part of the immune response, and as the catalysis of chemical reactions. One of the most important is hemoglobin, which helps the blood to carry oxygen throughout the body. Proteins were first identified in the 19th century and their name derives from the Greek for ...

    • Loading...
    locked icon

    Sign in to access this content

    Get a 30 day FREE TRIAL

    • Watch videos from a variety of sources bringing classroom topics to life
    • Read modern, diverse business cases
    • Explore hundreds of books and reference titles