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  2. Protein - Wikipedia

    en.wikipedia.org/wiki/Protein

    The words protein, polypeptide, and peptide are a little ambiguous and can overlap in meaning. Protein is generally used to refer to the complete biological molecule in a stable conformation, whereas peptide is generally reserved for a short amino acid oligomers often lacking a stable 3D structure. But the boundary between the two is not well ...

  3. Protein structure - Wikipedia

    en.wikipedia.org/wiki/Protein_structure

    Protein structure is the three-dimensional arrangement of atoms in an amino acid-chain molecule. Proteins are polymers – specifically polypeptides – formed from sequences of amino acids, which are the monomers of the polymer. A single amino acid monomer may also be called a residue, which indicates a repeating unit of a polymer.

  4. Protein (nutrient) - Wikipedia

    en.wikipedia.org/wiki/Protein_as_nutrient

    Protein is a nutrient needed by the human body for growth and maintenance. Aside from water, proteins are the most abundant kind of molecules in the body.

  5. Molecule - Wikipedia

    en.wikipedia.org/wiki/Molecule

    The definition of the molecule has evolved as knowledge of the structure of molecules has increased. ... e.g. proteins, the amino acids of which they are composed ...

  6. Protein domain - Wikipedia

    en.wikipedia.org/wiki/Protein_domain

    Pyruvate kinase, a protein with three domains (In molecular biology, a protein domain is a region of a protein's polypeptide chain that is self-stabilizing and that folds independently from the rest. Each domain forms a compact folded three-dimensional structure. Many proteins consist of several domains, and a domain may appear in a variety of ...

  7. Macromolecule - Wikipedia

    en.wikipedia.org/wiki/Macromolecule

    A macromolecule is a very large molecule important to biological processes, such as a protein or nucleic acid. It is composed of thousands of covalently bonded atoms . Many macromolecules are polymers of smaller molecules called monomers .

  8. Collagen - Wikipedia

    en.wikipedia.org/wiki/Collagen

    Tropocollagen molecule: three left-handed procollagens (red, green, blue) join to form a right-handed triple helical tropocollagen. Collagen (/ ˈ k ɒ l ə dʒ ə n /) is the main structural protein in the extracellular matrix of the connective tissues of many animals. It is the most abundant protein in mammals, [1] making up 25% to 35% of ...

  9. Protein complex - Wikipedia

    en.wikipedia.org/wiki/Protein_complex

    Kinesin is a protein functioning as a molecular biological machine. It uses protein domain dynamics on nanoscales. A protein complex or multiprotein complex is a group of two or more associated polypeptide chains. Protein complexes are distinct from multidomain enzymes, in which multiple catalytic domains are found in a single polypeptide chain ...

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