Short Answer TypeGlucose on reaction with HI gives n-hexane. What does it suggest about the structure of glucose?
Write any two reactions of glucose which cannot be explained by the open chain structure of glucose molecule.
What is essentially the difference between α-form of glucose and β-form of glucose? Explain.
Primary structure of proteins: Each polypeptide chain in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be the primary structure of proteins.
2. The secondary structure of proteins: The secondary structure of proteins refers to the shape in which a long polypeptide can exist. The two different secondary structures possible are α-helix structure and β-pleated sheet structure.
(i) α-Helical structure: In α-Helix structure, a polypeptide chain forms all possible hydrogen bonds by twisting into a helix with -NH group of each amino acid residue and hydrogen bonded to >C=O of an adjacent turn of the helix. The structure can be drawn as follows.
(ii) β-pleated structure: In a β-pleated structure, all peptide chains are stretched out to nearly maximum extensions and then laid side by side which are held together by intermolecular hydrogen bonds.
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