BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Examples of proteins with quaternary structure include hemoglobin, DNA polymerase, ribosomes, antibodies, and ion channels.

Detailed explanation-2: -Correct answer: 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.

Detailed explanation-3: -Proteins with a quaternary structure can be classified into homomultimeric, that is, proteins that have identical subunits, and heteromultimeric, which are proteins with different types of subunits.

Detailed explanation-4: -Explanation: Quaternary structure of a protein is the arrangement of protein subunits in a multi-subunit complex. Many proteins are composed of more than one polypeptide chain. These polypeptide chains fold to form a subunit of a complex protein.