More than one globular or fibrous protein subunit now interact to produce structure, which results from ionic, hydrophilic, and hydrophobic interactions.

Answer;

Quaternary structure

Explanation;

-Amino acids link together end-to-end forming the primary structure of proteins.

-Chemical properties of amino acid groups within a sequence interact with one another in secondary protein structure resulting in hydrogen bonding and chain folding.

-Intramolecular bonding of polypeptide chains produces numerous alpha helices and beta sheets.

-Globular and fibrous shapes are created with tertiary structure of proteins caused by further folding due to disulfide bridges, hydrophobicity and Van der Waals forces.

-More than one globular or fibrous protein subunit now interact to produce quaternary structure, which results from ionic, hydrophilic, and hydrophobic interactions.

i thinking chemical change