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Protein structure is the three-dimensional arrangement of atoms in a protein molecule.

Protein structure levels. "Protein Structure, from Primary to Quaternary Structure." Wikipedia. Wikimedia Foundation, n.d. Web. 25 July 2016.

A sequence of amino acids make up each protein; these sequences are known as
Select Option polypeptidestriglycerides
. Proteins must be folded into a spatial configuration in order to be able to perform their biological function; folding involves a number of non-covalent interactions that include
Select Option hydrogen bondingsigma bonds
Select Option Van der Waals forceshydrophobic repulsion
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