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Q)

a)Give reasons for the following : (i) Glucose does not give 2,4-DNP test and Schiff’s test (ii) Amino acids have high melting points and are soluble in water. (b) What is meant by the secondary structure of proteins?

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A)
Solution :
(i) In the cyclic structure of glucose - CHO group is not free as it forms as hemiacetal linkage with -OH group at $C-5$
(ii) The amino acids have high melting points and solubility in water as they form zwitter ions which have strong forces of attraction.
(iii) Secondary structure of proteins refers to the shape in which a long polypetide chain can exist
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