Short Answer TypeWrite one difference between α -helix and β -pleated structures of proteins.
α - helix: It has a polypeptide chain which forms all possible hydrogen bonds twisting it into a right-handed screw. (helix)
β - pleated: It has peptide chain which is stretched out to nearly maximum extension and then laid side by side which are held by intermolecular hydrogen bonds.
Among the following, which one acts as a food preservative?
Aspartame, Aspirin, Sodium Benzoate, Paracetamol
Shyam went to a grocery shop to purchase some food items. The shopkeeper packed all the items in polythene bags and gave them to Shyam. But Shyam refused to accept the polythene bags and asked the shopkeeper to pack the items in paper bags. He informed the shopkeeper about the heavy penalty imposed by the government for using polythene bags. The shopkeeper promised that he would use paper bags in future in place of polythene bags.
Answer the following :
(a) Write the values (at least two) shown by Shyam
(b) Write one structural difference between low-density polythene and high-density polythene.
(c) Why did Shyam refuse to accept the items in polythene bags?
(d) What is a biodegradable polymer ? Give an example
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