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  2. Proteins are organic compounds that contain four elements: nitrogen, carbon, hydrogen, and oxygen. To comprehend the full scope of proteins, it is crucial to understand various properties, including the basic biological molecule, peptides, polypeptide chains, amino acids, protein structures, and the processes of protein denaturation.

  3. protein, highly complex substance that is present in all living organisms. Proteins are of great nutritional value and are directly involved in the chemical processes essential for life.

  4. 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.

  5. Protein - Wikipedia

    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 ...

  6. Protein - Definition and Examples - Biology Online Dictionary

    www.biologyonline.com/dictionary/protein

    In biology and biochemistry, a protein is a biomolecule or a macromolecule characterized by being made up of chain(s) of amino acids joined together by peptide bonds. In nutrition, a protein refers to food rich in biomolecular proteins and provides about 4 cal/gram food energy.

  7. 3.7: Proteins - Types and Functions of Proteins - Biology...

    bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology...

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

    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.

  9. Protein Definition & Meaning - Merriam-Webster

    www.merriam-webster.com/dictionary/protein

    : any of various naturally occurring extremely complex substances that consist of amino-acid residues joined by peptide bonds, contain the elements carbon, hydrogen, nitrogen, oxygen, usually sulfur, and occasionally other elements (such as phosphorus or iron), and include many essential biological compounds (such as enzymes, hormones, or antibo...

  10. What is a protein? A biologist explains - The Conversation

    theconversation.com/what-is-a-protein-a-biologist-explains-152870

    A protein is a basic structure that is found in all of life. It’s a molecule. And the key thing about a protein is it’s made up of smaller components, called amino acids.

  11. 3.4 Proteins - Biology - OpenStax

    openstax.org/books/biology/pages/3-4-proteins

    Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective; they may serve in transport, storage, or membranes; or they may be toxins or enzymes.