BIOMOLECULES AND ENZYMES

Detailed explanation-1: -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-2: -The Alpha Helix. An alpha helix is an element of secondary structure in which the amino acid chain is arranged in a spiral. The kinemage linked above shows an individual alpha helix, viewed from the N-terminal end to resemble the “helical wheel” (see figure below).

Detailed explanation-3: -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.

Detailed explanation-4: -Hence, the correct answer is ‘Secondary structure’.

Detailed explanation-5: -Summary – Alpha vs Beta Helix Both types are secondary structures of proteins. However, alpha helix is a helical twist of amino acid sequences. In contrast, beta helix formation happens via the Hydrogen bonding of parallel or anti-parallel beta sheets.