What characterizes the secondary structure of proteins?
1. It is the sequence of amino acids in a polypeptide chain.
2. It includes α-helices and β-pleated sheets formed by hydrogen bonds.
3. It represents the overall three-dimensional structure of a single polypeptide.
4. It involves interactions between different polypeptide chains or subunits.
Subtopic:  Structural Organisation of Proteins |
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