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प्रश्न
Can you describe what happens when milk is converted into curd or yoghurt from your understanding of proteins.
उत्तर
Proteins are macromolecules formed by the polymerization of amino acids. Structurally, proteins are divided into four levels.
(a) Primary structure – It is the linear sequence of amino acids in a polypeptide chain.
(b) Secondary structure – The polypeptide chain is coiled to form a three-dimensional structure.
(c) Tertiary structure – The helical polypeptide chain is further coiled and folded to form a complex structure.
(d) Quaternary structure – More than one polypeptide chains assemble to form the quaternary structure.
Milk has many globular proteins. When milk is converted into curd or yoghurt, these complex proteins get denatured, thus converting globular proteins into fibrous proteins. Therefore, by the process of denaturation, the secondary and tertiary structures of proteins are destroyed.
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संबंधित प्रश्न
Find out and make a list of proteins used as therapeutic agents. Find other applications of proteins (e.g., cosmetics, etc.)
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Match List - I with List - II.
| List - I | List - II | ||
| (a) | Protein | (i) | C = C double bonds |
| (b) | Unsaturated fatty acid |
(ii) | Phosphodiester bonds |
| (c) | Nucleic acid | (iii) | Glycosidic bonds |
| (d) | Polysaccharide | (iv) | Peptide bonds |
Choose the correct answer from the options given below.
Match List - I with List - II.
| List - I | List - II | ||
| (a) | Protein | (i) | C = C double bonds |
| (b) | Unsaturated fatty acid | (ii) | Phosphodiester bonds |
| (c) | Nucleic acid | (iii) | Glycosidic bonds |
| (d) | Polysaccharide | (iv) | Peptide bonds |
Choose the correct answer from the options given below.
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Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.
Protein ______
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