Bonds present in DNA

1.H- bonds-

• A always pairs  with T by a double H-bond(A=T) & C always pairwith G by a triple H-bond G=_C.
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Phosphodiester bond - The bond between phosphate group of one nucleotide  and  3' OH sugar group of another nuclotide in a polynuclotide molecule.(between adjecent nucleotide) .

Glycosidic bond- 

• glycosidic bond or glycosidic linkage is a type of covalent bond that joins a carbohydrate (sugar) molecule to another group, which may or may not be another carbohydrate. Glycosidic bond is formed between the hemiacetal group of a saccharide  and the hydroxyl group of some organic compound such as an alcohol. A substance containing a glycosidic bond is a glycoside.Glucose and ethanol combine to form ethyl glucoside and water.

Q.DNA is not hydrolyzed by alkali whereas RNA is readily hydrolysed. This is due to -

1.The double helical structure of DNA

2.The presence of uridine in RNA 

3.Due to features observed in RNA such as stem-loop structures.

4.The presence of 2'-OH group in RNA

Ans. 4 (The presence of 2'-OH group in RNA)

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