BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The correct answer is False. All the proteins have primary, secondary, and tertiary structures, but only a few proteins are able to attain quaternary structure arrangements.

Detailed explanation-2: -Every protein at least contains a primary, secondary, and tertiary structure. Only some proteins have a quaternary structure as well. The primary structure is comprised of a linear chain of amino acids.

Detailed explanation-3: -Quaternary structure is the interaction of two or more folded polypeptides. Many proteins require the assembly of several polypeptide subunits before they become active. If the final protein is made of two subunits, the protein is said to be a dimer.

Detailed explanation-4: -The secondary structure is determined by the dihedral angles of the peptide bonds, the tertiary structure by the folding of protein chains in space. Association of folded polypeptide molecules to complex functional proteins results in quaternary structure.

Detailed explanation-5: -Quaternary structure is an important protein attribute that is closely related to its function. Proteins with quaternary structure are called oligomeric proteins. Oligomeric proteins are involved in various biological processes, such as metabolism, signal transduction, and chromosome replication.