Question

When a protein is composed of more than one polypeptide chain, the arrangement of the chains is called the ____________ structure.

A. primary
B. secondary
C. tertiary
D. quaternary

Answer 1

Answer:

D. quaternary is the correct answer.

Explanation:

The quaternary structure in the proteins consists of two or more different or same polypeptide chains.

Quaternary structure of a protein is important because:

• It provides a protein to own various functions.

• It provides a protein to undergo complex conformational variations.

The bonds required in holding the quaternary structure of proteins are

• hydrogen bonds

• covalent bonds

• van der Waals

• ionic bonds

Examples of proteins having the quaternary structure:

• hemoglobin.

• ion channels.

• DNA polymerase