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Question

QUESTION 14.12(i)

Define the following as related to proteins.
Peptide linkage

Define the following as related to proteins.
Primary structure

Define the following as related to proteins.
Denaturation.

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Solution

Peptide linkage: peptide linkage is an amide linkage formed between - COOH group and -- NH2 group.
When carboxyl group of one amino acid reacts with the amino group of the other, a water molecule is eliminated and peptide linkage is formed.

Primary structure: Each polypeptide in a protein has amino acids linked with each other in a specific sequence and this sequence of amino acids is called the primary structure of that particular Protein. any change in the primary structure creates different protein

Denaturation: In a biological system, a protein is found to have a unique 3-dimensional structure and a unique biological activity. In such a situation, the protein is called native protein. When a protein in its native form, is subjected to physical change in pH, the hydrogen bonds are disturbed the protein globules unfold, helix get uncoiled and protein loses its biological activity. This is called denaturation of the protein. Secondary and tertiary. structures are destroyed but the primary structure remains as such. For example, coagulation of egg while on boiling curdling of milk etc.


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