LIFE SCIENCE

Detailed explanation-1: -The tertiary structure is primarily due to interactions between the R groups of the amino acids that make up the protein.

Detailed explanation-2: -[B] The quaternary structure of a protein is the 3D structure that forms due to interactions between the R groups of amino acids.

Detailed explanation-3: -Quaternary structure is held together by noncovalent bonds between complementary surface hydrophobic and hydrophilic regions on the polypeptide subunits. Additionally, acidic and basic side chains can form salt linkages.

Detailed explanation-4: -The quaternary structure describes the arrangements of subunits in a protein that contains more than one subunit. Four major types of attractive interactions determine the shape and stability of the folded protein: ionic bonding, hydrogen bonding, disulfide linkages, and dispersion forces.

Detailed explanation-5: -Quaternary structure in proteins is the most intricate degree of organization still considered a single molecule. To be considered to have quaternary structure, a protein must have two or more peptide chains forming subunits. The subunits can be different or identical, and in most cases they are arranged symmetrically.