Given below are two statements: 
Statement-I : Tertiary structure is absolutely necessary for the many biological activities of proteins.
Statement-II : Peptide bonds, hydrogen bonds, Disulfide bond are present in the tertiary structure of a protein.
In light of the above statements, choose the correct answer from the options given below :

NCERT CLASS-XI – Page No. 151.

biologists describe the protein structure at four levels. 

The linear sequence of amino acids i.e., the positional information in a protein is called the primary structure of a protein.

Protein thread are folded into other forms 9alfa helix or beta pleated sheet) is called the secondary structure.

The long protein chain is also folded upon itself like a hollow woolen ball, giving rise to the tertiary structure.This gives us a 3-dimensional view of a protein. 

Tertiary structure is absolutely necessary for the many biological activities of proteins.

Some proteins are an assembly of more than one polypeptide or subunits.The manner in which these individual folded polypeptides or subunits are arranged with respect to each other is known as quaternary structure.