Protein structure

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Proteins are made up of polymers of amino acids. The amino acids are joined together by peptide bonds in a condensation reaction. This type of reaction is catalysed by the ribosome in the cytoplasm and releases a water molecule. There are four levels of protein structure. The primary structure is the linear sequence of amino acids in a polypeptide chain.

http://www.chemguide.co.uk/organicprops/aminoacids/proteinstruct.html