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  4. Most common types of secondary structures of proteins are

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Q. Most common types of secondary structures of proteins are

Biomolecules

Solution:

Due to regular folding of backbone of the peptide chain, two most common secondary structures of proteins are $\alpha$-helix and $\beta$-pleated structures. In $\alpha$-helix, all $H$-bonds are formed by twisting the chain into a right handed helix. In $\beta$-pleated, all peptide chains are stretched to maximum extension and then laid side by side and connected by hydrogen bonds.