Match the levels of protein structure with their descriptions.
 

	List – I		List – II
A.	Primary Structure	I.	The sequence of amino acids in the protein
B.	Secondary Structure	II.	The 3-dimensional folding of the protein molecule
C.	Tertiary Structure	III.	The arrangement of protein subunits in a complex protein
D.	Quaternary Structure	IV.	The folding of protein segments into helices or other shapes

	(A)	(B)	(C)	(D)
1.	II	I	IV	III
2.	I	II	III	IV
3.	I	IV	II	III
4.	IV	II	I	III