Question

Match List I with List II :

List - I		List – II
A.	Primary structure of protein	i.	Human haemoglobin
B.	Secondary structure of protein	ii.	Dispulphide bonds
C.	Tertiary structure of protein	iii.	Polypeptide chain
D.	Quaternary structure of protein	iv.	\(Alpha\ helix\ and\ \beta\ sheet\)

Choose the correct answer from the options given below :

• A. A-III, B-IV, C-II, D-I
• B. A-III, B-II, C-I, D-IV
• C. A-I, B-III, C-II, D-IV
• D. A-IV, B-III, C-II, D-I

Answer 1

The Correct Option is A

A. Primary structure of protein: The primary structure is the linear sequence of amino acids in a polypeptide chain. A-II

B. Secondary structure of protein: The secondary structure refers to local folded structures within the polypeptide chain, stabilized by hydrogen bonds. Common secondary structures include alpha helices and beta sheets. B-IV

C. Tertiary structure of protein: The tertiary structure is the overall 3D arrangement of a polypeptide chain, stabilized by various interactions, including disulfide bonds, hydrogen bonds, hydrophobic interactions, and ionic bonds. C-II

D. Quaternary structure of protein: The quaternary structure is the arrangement of mul tiple polypeptide chains (subunits) in a protein complex. Human hemoglobin, composed of four subunits, is an example of a protein with quaternary structure. D-I