1. 3.7: Proteins - Types and Functions of Proteins

    https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_(Boundless)/03%3A_Biological_Macromolecules/3.07%3A_Proteins_-_Types_and_Functions_of_Proteins

    Proteins are macromolecules composed of amino acids that perform essential functions in every system of the human body. Learn about the different types of proteins, such as enzymes, hormones, and structural proteins, and how their shape determines their function.

  2. What Are Proteins? Protein Definition, Functions, Examples

    https://sciencenotes.org/what-are-proteins/

    Proteins are chains of amino acids that perform various functions in organisms. Learn about the structure and examples of proteins, and how they are coded by DNA or RNA.

  3. Proteins and Polypeptides: basics, structures, properties

    https://peptidesguide.com/proteins.html

    Learn about the definition, functions, sources, and structures of proteins and polypeptides, the organic compounds composed of amino acids. Explore the four levels of protein structure: primary, secondary, tertiary, and quaternary, and how they affect protein activity and function.

  4. Protein | Definition, Structure, & Classification | Britannica

    https://www.britannica.com/science/protein

    Protein is a complex substance of amino acids that is present in all living organisms and essential for life. Learn about the types, structure, and functions of proteins, as well as their sources, synthesis, and regulation.

  5. What are proteins and what do they do? - MedlinePlus

    https://medlineplus.gov/genetics/understanding/howgeneswork/protein/

    Proteins are large, complex molecules made of amino acids that play many critical roles in the body. Learn about the types, examples, and functions of proteins, such as antibodies, enzymes, messengers, structural components, and transport/storage proteins.

  6. 3.4: Proteins - Biology LibreTexts

    https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_1e_(OpenStax)/1%3A_The_Chemistry_of_Life/3%3A_Biological_Macromolecules/3.4%3A_Proteins

    Proteins are polymers of 20 types of amino acids, each with a different R group that determines its chemical nature. Learn about the types and functions of proteins, such as enzymes, hormones, structural, and contractile proteins, and how they are organized at different levels.

  7. Protein Function | Learn Science at Scitable - Nature

    https://www.nature.com/scitable/topicpage/protein-function-14123348/

    Proteins are diverse and versatile macromolecules that perform various functions in cells, such as structural support, biochemical catalysis, and signal transduction. Learn how proteins...

  8. Protein - Wikipedia

    https://en.wikipedia.org/wiki/Protein

    Proteins can be informally divided into three main classes, which correlate with typical tertiary structures: globular proteins, fibrous proteins, and membrane proteins. Almost all globular proteins are soluble and many are enzymes.

  9. 7.2: Types of Protein - Medicine LibreTexts

    https://med.libretexts.org/Courses/Lincoln_Land_Community_College/An_Introduction_to_Human_Nutrition_(Shanle_and_Dowell)/07%3A_Proteins_and_Amino_Acids/7.02%3A_Types_of_Protein

    Learn about the components, functions, and sources of protein, the macronutrient that contains nitrogen and twenty types of amino acids. Explore how amino acids are classified by their chemical properties and how they are combined to form proteins.