EVERYDAY SCIENCE

Detailed explanation-1: -Hence, the correct answer is ‘Secondary structure’.

Detailed explanation-2: -The most common type of secondary structure of the protein is the alpha-helix. In the alpha-helix protein, a hydrogen bond is formed between the N−H group to the C=O. group of the amino acid. The alkyl groups of the alpha-helix chain are not involved in the H bonds but maintain the alpha-helix structure.

Detailed explanation-3: -The secondary structures of proteins form the amide chains in several orientations. The peptide chains comprises amino acid sequences bound by amide bonds. Therefore, there are 2 main secondary structures in proteins which are alpha helix and beta helix.

Detailed explanation-4: -Secondary structure of protein refers to local folded structures that form within a polypeptide due to interactions between atoms of the backbone.

Detailed explanation-5: -Beta pleated sheet is an example of the secondary structure of a protein. The beta sheet is composed of beta strands which are polypeptides linked by hydrogen bonding. Beta strands have a 2 residues repeat and when the polypeptide is fully extended, the distance between adjacent amino acids is 3.5 A.