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

 The question requires matching the levels of protein structure with their appropriate descriptions or examples. Let's analyze each level of protein structure:

1. Primary Structure of Protein: This refers to the unique sequence of amino acids in a polypeptide chain. Therefore, this matches with 'Polypeptide chain'. Hence, the correct match for Primary structure (A) is iii.
2. Secondary Structure of Protein: This level refers to the regular local patterns of coils or folds within a polypeptide chain, commonly known as alpha helices and beta sheets. This matches with 'Alpha helix and beta sheet'. Hence, the correct match for Secondary structure (B) is iv.
3. Tertiary Structure of Protein: This structure refers to the overall 3D shape of a polypeptide, stabilized by various interactions and bonds, including disulfide bonds. Hence, Tertiary structure (C) matches with ii.
4. Quaternary Structure of Protein: This involves the combination of multiple polypeptide chains (subunits) to form a functional protein, such as human hemoglobin. Thus, Quaternary structure (D) matches with i.

Bringing it all together, the correct matches are:

A.	Primary structure of protein	iii.	Polypeptide chain
B.	Secondary structure of protein	iv.	Alpha helix and beta sheet
C.	Tertiary structure of protein	ii.	Dispulphide bonds
D.	Quaternary structure of protein	i.	Human haemoglobin

The correct answer is therefore: A-III, B-IV, C-II, D-I.