NEET Zoology Biomolecules Questions Solved


Define the following as related to proteins :                                   (3 marks)

(i) Peptide linkage                    (ii) Primary structure           (iii) Denaturation

  (i) Peptide linkage : A peptide linkage is an amide linkage formed between -COOH group of

      α-amino acid and NH2 group of the other α-amino acid by loss of a molecule of water. The

      -CO-NH-bond formed is called petide linkage.



 (ii) Primary structure : Proteins may have one or more polypeptide chains. Each polypeptide in a

      protein has amino acids linked with each other in a specific sequence and it is this sequence of

      amino acids that is called the primary structure of that protein.


(iii) Denaturation : Due to coagulation of globular protein under the influence of change in tem-

      perature, change in pH etc., the native shape of the protein is destroyed and biological activity

      is lost and the formed protein is called denaturated proteins and the phenomenon is denatura-


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