Definition Tertiary

Feb 3, 2012

4 levels of protein structure?

I know the definition for the following 4 levels of protein structure but can anyone explain the 4 levels to me….. in elementary (bio 101) terms :)

primary structure
secondary structure
tertiary structure
quaternary structure

Primary–the order of amino acids linked together by peptide bonds

Secondary–the formation of alpha-helices or beta-sheets

Tertiary–the three dimensional folded shape of the protein

Quaternary–only seen in proteins with 2 or more polypeptide chains. Describes how the polypeptides interact with each other.

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