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. The primary structure of proteins represents the sequence of amino acids.

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: -As mentioned above, quaternary structure allows a protein to have multiple functions. It also allows for a protein to undergo complicated conformational changes. This has several mechanisms. First, an individual subunit can change shape.

Detailed explanation-4: -Quaternary structure of a protein involves the assembly of subunits. Hemoglobin, p53 and DNA polymerase are all composed of subunits, while myoglobin is a functional single sequence. Since myoglobin does not have multiple subunits, it does not have quaternary structure.

Detailed explanation-5: -By definition, only multimeric proteins have quaternary structure; it refers to the arrangement of two or more folded polypeptide chains. The interactions stabilizing protein quaternary structure may be covalent or noncovalent.