NEET Zoology Biomolecules Questions Solved

BOARD

Define the following terms 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-

      tion.

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