Protein structure is directly related to the function of the protein. Which of the following is an accurate description of the level of structure in a protein?

a. Quaternary protein structure is the localized, repetitive twisting or folding of the polypeptide chain.

b. Secondary structure is the unique sequence of amino acids linked together.

c. Tertiary protein structure is the overall three-dimensional shape involving interactions between various amino acids and their side groups.

d. Primary protein structure refers to the polypeptide chain folds that give a protein a unique shape.

c. Tertiary protein structure is the overall three-dimensional shape involving interactions between various amino acids and their side groups.

Explanation:

Protein is made up of amino acids. These amino acids when joins together and make a polypeptide chain that makes the primary structure of the protein.

When this primary polypeptide chain becomes slightly compact and coiled by making hydrogen bond then it is called the secondary structure of the protein.

The tertiary structure of a protein is the overall three-dimensional arrangement of the polypeptide chain which is generally stabilized by both hydrophobic and hydrophilic interactions between various amino acids and their side chain.

The three-dimensional structure and shape of protein determines the function of a protein.