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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance3 Marks
Question
Explain - Nucleoside & Nucleotide
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Answer

→ Nucleoside
→ A nitrogenous base is linked to the OH of 1' C pentose sugar through a N-glycosidic linkage to form a nucleoside, such as:
→ (i) adenosine or deoxyadenosine,
→ (ii) guanosine or deoxyguanosine
→ (iii) cytidine or deoxycytidine
→ (iv) uridine or deoxythymidine
Image
→ Nucleotide
→ 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.
Image
→Phosphodiester linkage
→ Two nucleotides are linked through 3'-5' phosphodiester linkage to form a dinucleotide.

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