Which of the following bond is not present in nucleotides ?
a) Phospho di ester bond
b) Phospho-ester bond
c) Hydrogen bond
d)Glycosidic bond

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a and c only

c and d only

b and c only

a and b only

answer is C.

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Detailed Solution

A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group.A nitrogenous base is linked to the OH of 1' C pentose sugar through a N-glycosidic linkage to form a nucleoside.

When a phosphate group is linked to OH of 5' C of a nucleoside through phosphoester linkage, a corresponding nucleotide (or deoxynucleotide depending upon the type of sugar present) is formed.

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