Question

Name the bond present between pentose sugar and nitrobase in a nucleoside

Answer 1

Answer:

nucleoside consists of a pentose sugar to which a nitrogen base is attached by a glycosidic bond. The sugar may be ribose or deoxyribose. The nitrogenous bases are purines or pyrimidines.

Answer 2

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Answer:-

⚡DNA is a polymer of nucleotides each of which has a pentose sugar, a nitrogenous base and phosphate group. The base of a nucleotide is joined covalently (at N-1 of pyrimidines and N-9 of purines) in an N –β- glycosyl bond to the 1’ carbon of sugar. The phosphate is linked by a phosphodiester linkage to the 5’ carbon. Two complementary bases of two strands of DNA are paired by hydrogen bonding; adenine makes two hydrogen bonds with thymine and guanine makes three hydrogen bonds with cytosine. Two successive nucleotides of DNA are joined by phosphodiester linkage in which the 5’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide. Thus, phosphate and pentose sugars of DNA are joined by phosphodiester linkage; the correct answer is B.⚡

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