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Four basic levels of structure:

1. Primary

2. Secondary

3. Tertiary

4. Quaternary

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Sequence of Amino Acids joined by Peptide Bonds

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When peptides bond fold for the first time to form the alpha-helices and the B-pleated sheets. It is formed by hydrogen bonds between the carbonyl group of one amino acid and amino group of another.

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interactions between the r groups that form the structure