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

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

    A protein is a naturally occurring, extremely complex substance that consists of amino acid residues joined by peptide bonds. Proteins are present in all living organisms and include many essential biological compounds such as enzymes, , and antibodies.

  2. Protein - Wikipedia

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

    Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organisms, and transporting molecules from one location ...

  3. High Protein Foods: 16 Foods for High Protein Meals - Healthline

    https://www.healthline.com/nutrition/high-protein-foods

    Here are 16 delicious foods that are high in protein. 1. Eggs. Whole eggs are a good source of protein that’s easy to absorb, and they’re also an excellent source of vitamins, minerals ...

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

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

    Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body’s tissues and organs.

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

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

    Proteins are a large class of biological molecules consisting of chains of amino acids called polypeptides. A single polypeptide can make a protein, although many proteins consists of multiple polypeptide subunits.

  6. Proteins: Properties, Structure, Types, Functions - Microbe Notes

    https://microbenotes.com/amino-acids-proteins/

    What are Proteins? Proteins are highly complex macromolecules consisting of one or more long chains of amino acids linked together by peptide bonds. A protein is a macronutrient that is present in all living beings and is directly involved in various metabolic pathways. Proteins are species-specific and are unique to each organism.

  7. 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 essential for the main physiological processes of life and perform functions in every system of the human body. A protein’s shape determines its function. Proteins are composed of amino acid subunits that form polypeptide chains.

  8. Protein: What It Is, Types, Uses, Needs, Deficiency - Verywell Health

    https://www.verywellhealth.com/what-is-a-protein-5076292

    Protein is vital to the functioning of cells in living organisms. Proteins are required for the structure and regulation of the body’s tissues and organs. They are made up of long chains of amino acids—at least 20 different types of amino acids, in fact.

  9. 3.7: Proteins - Biology LibreTexts

    https://bio.libretexts.org/Courses/Canada_College/Human_Biology_Biol_011_Textbook/03%3A_Chemistry_of_Life/3.07%3A_Proteins

    Proteins are made of smaller units called amino acids. There are 20 different common amino acids needed to make proteins. All amino acids have the same basic structure, which is shown in Figure 3.7.3 3.7. 3. Only the side chain (labeled R in the figure) differs from one amino acid to another.