Question
A nucleoside is made up of:
1. Pyrimidine
2. Histone
3. Sugar
4. Purine
5. Phosphate
A. 1,2 & 3
B. 1,3 & 4
C. 1,3 & 5
D. 2,3 & 4
Show Answer
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Correct Answer » B
Explanation
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Ans.B
Nucleosides are derivatives of purines and pyrimidines that have a sugar linked to ring nitrogen of a purine or pyrimidine
Numerals with a prime (eg, 2′ or 3′) distinguish atoms of the sugar from those of the heterocycle. The sugar in ribonucleosides is D-ribose, and in deoxyribonucleosides is 2-deoxy-D-ribose.
Both sugars are linked to the heterocycle by an a-N-glycosidic bond, almost always to the N-1 of a pyrimidine or to N-9 of a purine“.
Additional phosphoryl groups, ligated by acid anhydride bonds to the phosphoryl group of a mononucleotide, form nucleoside diphosphates and triphosphates
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