BIOMOLECULES AND ENZYMES

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

Detailed explanation-2: -Secondary structure The most common types of secondary structures are the helix and the pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of another.

Detailed explanation-3: -In the alpha helix, the bonds form between every fourth amino acid and cause a twist in the amino acid chain. In the -pleated sheet, the “pleats” are formed by hydrogen bonding between atoms on the backbone of the polypeptide chain.

Detailed explanation-4: -The secondary structure consists of local packing of polypeptide chain into -helices and -sheets due to hydrogen bonds between peptide bond – central carbon backbone.

Detailed explanation-5: -An -helix secondary structure is stabilized by hydrogen bonds between carbonyl oxygen and the amino group of every third residue in the helical turn with each helical turn consisting of 3.6 amino acid residues (Fig. 10.1A). The side chain of amino acids is projected outward from the outer helical surface.