Question

A protein containing more than one polypeptide chain exhibits the ________ level of protein structure.

Answer 1

Answer:

the correct option is D.

Explanation:

in case of quaternary level of protein structure , protein has more than one polypeptide chains  and in this level , the polypeptide chains are aggregated and held together by hydrophobic interactions, hydrogen and ionic bonds. this specific arrangement is called the quaternary structure.for example :-

Haemoglobin the oxygen carrying protein of red blood cells, exhibits such a structure.