1.

The secondary structureof a protein refers to

Answer»

fixed configuration of the polypeptide backbone
`alpha`-helical backbone
hydrophobic interactions
sequence of `alpha`-amino acids

Solution : The secondary structure of a protein refers to the shape in which a LONG peptide chain can exist. There are two different conformations of the peptide linkage PRESENT in protein, these are `alpha`-helix and `beta`-conformation. The `alpha`-helix always bas a right handed arrangement. In `beta`-conformation all peptide chains are STRETCHED out to NEARLY maximum extension and then laid SIDE by side and held together by intermolecular hydrogen bonds. The structure resembles the pleated folds of drapery and therefore is known as `beta`-pleated sheet.


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