Question

Choose the correct answer from the alternatives given:
Quaternary structure of the protein is associated with

• A. Orientation of multi-subunits of a protein
• B. Three dimensional structure of a peptide chain
• C. Hydrogen bonding
• D. Amino acid sequence

Answer 1

Answer: (A)

Orientation of multi-subunits of a protein

Quaternary structure is the arrangement of the multiple folded proteins subunits in multiple subunit complexes. Proteins with quaternary structure include haemoglobin, DNA polymerase and ion channels.

B. Three-dimensional structure refers to the tertiary structure of the protein.

C. The amino acid sequence determines the primary structure of the polypeptide chain.

D. Bonds like hydrogen bonding, weak electrostatic bonding, disulphide bonding, van der Waals bonding is found in the tertiary structure of the protein.

Hence, the correct answer is 'Orientation of multi-subunits of a protein'