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Question : 21
Total: 26
Define the following with an example of each :
(a) Polysaccharides
(b) Denatured protein
(c) Essential amino acids
OR
(a) Write the product when D-glucose reacts with conc.HNO 3
(b) Amino acids show amphoteric behaviour. Why?
(c) Write one difference betweenα β
(a) Polysaccharides
(b) Denatured protein
(c) Essential amino acids
OR
(a) Write the product when D-glucose reacts with conc.
(b) Amino acids show amphoteric behaviour. Why?
(c) Write one difference between
Solution:
(a) Carbohydrates that give large number of monosaccharide units on hydrolysis / large number of monosaccharide units joined together by glycosidic linkage starch/ glycogen/ cellulose (or any other)
(b) Proteins that lose their biological activity / proteins in which secondary and tertiary structures are destroyed Curdling of milk (or any other)
(c) Amino acids which cannot be synthesised in the body.
Valine/Leucine (or any other)
OR
(a) When D-glucose reacts with conc.HNO 3
This zwitter ion can act both as an acid and a base showing amphoteric behaviour.
R −
−
− O −
R −
−
− O −
R −
−
− OH
(c)α β α β
(b) Proteins that lose their biological activity / proteins in which secondary and tertiary structures are destroyed Curdling of milk (or any other)
(c) Amino acids which cannot be synthesised in the body.
Valine/Leucine (or any other)
OR
(a) When D-glucose reacts with conc.
(b) In aqueous solution, the carboxyl group present in amino acid can lose a proton and the amino group can accept a proton to form zwitter ion.
This zwitter ion can act both as an acid and a base showing amphoteric behaviour.
(c)
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