Explain the following :
(i) Amino acids behave like salts rather than simple amines or carboxylic acids.
(ii) The two strands of DNA are complementary to each other.
(iii) Reaction of glucose that indicates the carbonyl group is present as an aldehydic group in the open structure of glucose.

Explanation

(i) Due to zwitter ion formation amino acids behave like salts.

(ii) Two stransd of DNA are complementary to each because H-bonds are formed by specific pair of bases i.e., Adenine is linked with thymine by two H-bond and guanine is linked with cytosine by three H-bonds.
(iii) Reaction of glucose with `Br_2` water indicates that aldehylic group is present in open structure of glucose.