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neet BIOLOGYMedium

Match List-I with List-II:

List-I A. Primary structure of protein B. Secondary structure of protein C. Tertiary structure of protein D. Quaternary structure of protein

List-II I. Human haemoglobin II. Disulphide bonds III. Polypeptide chain IV. Alpha helix and \beta sheet

A

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

B

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

C

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

D

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

Step-by-Step Solution

According to the text and Figure 9.3:

  • Primary structure refers to the positional information (sequence of amino acids) in a polypeptide chain .
  • Secondary structure includes conformations like the Alpha helix and \beta -pleated sheet , .
  • Tertiary structure is the 3-dimensional folding of the protein, stabilised by bonds such as disulphide bonds (explicitly labelled in Figure 9.3c) , .
  • Quaternary structure is the assembly of multiple subunits; Human haemoglobin, which consists of 4 subunits, is the textbook example .
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