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X-ray diffraction of wool shows repeated structural units spaced at 5.2 a, which is changed to 7.0 Å on steaming. this is due to the conversion of secondary str
X-ray diffraction of wool shows repeated structural units spaced at 5.2 A, which is changed to 7.0 Å on steaming. This is due to the conversion of secondary structure from (a) B-sheet to random coil (b) a -helix to random coil (c) B-sheet to a -helix (d) a -helix to B-sheet
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Anup Padwal![best-answer]()
Option D Wool with a 5.2A° repeat would be typical of an Alfa-keratin structure which is primarily alfa-helical. When this is steamed and stretched, the peptides are extended into the beta conformation with the 7.0A° repeat. Similarly, when wool is processed to make yarn it is stretched into the beta conformation. Heating the beta-conformation wool yarn in sweaters and socks helps it to go back into its native alfa helical conformation and when this happens the wool shrinks.