In secondary structure of proteins:

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Only β plated sheets are present

The α helices present are only right-handed

The α helices present are usually left-handed

In an α-helix there is interaction between every third amino acid by the formation of intramolecular hydrogen bond.

answer is B.

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Detailed Solution

Some portions of the protein threads are folded and form the secondary structure of protein. The α helix and β pleated sheet are two types of secondary structures. In proteins only right-handed helices are observed. In an α-helix there is interaction between every fourth amino acid by the formation of intramolecular hydrogen bond.

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