Monomeric proteins do not have a. primary structure b. secondary structure c. tertiary structure d. quaternary structure

Answer: Quaternary structure

Explanation:

The proteins exists in all the structures such as primary, secondary and tertiary. The primary structure of the protein is simple, secondary is made of two sheets like structure.

The tertiary structure of the proteins is made of beta pleated structure. The monomeric proteins do not form quaternary structure. It is reserved for proteins having two or more polypeptide chains.

Hence the correct answer is Option D