One Word Answers
Short Answer Type
Multiple Choice QuestionsConsider a double helix. Are the base pairs?
part of the backbone structure
inside the helix
outside the helix
Short Answer Type
Long Answer TypeThe following reactions cannot be explained by its open chain structure:
(i) Despite having an aldehydic group, glucose does not give Schiff’s test and it does not react with sodium bisulphite and ammonia.
(ii) The penta-acetate of glucose does not react with hydroxylamine indicating absence of —CHO group.
(iii) Mutarotation: When glucose is crystallized from a concentrated solution at 30°C, it gives a form of glucose m.p. 146°C, [α]D = (+) 111°, on the other hand the β-form (m.p. 15°C), [α]D = (+) 19.2° is obtained on crystallization of glucose from a hot saturated aqueous solution at a temperature above 98°C. This behaviour cannot be explained by its open chain structure.
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