Biochemistry - Nucleic Acids - Discussion

Discussion :: Nucleic Acids - Section 1 (Q.No.3)

3. 

Nucleoside is a pyrimidine or purine base

[A]. covalently bonded to a sugar
[B]. ionically bonded to a sugar
[C]. hydrogen bonded to a sugar
[D]. none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Jackson said: (Dec 16, 2013)  
How is nucleoside can be pyrimidine or purine?

Hannah said: (Mar 27, 2014)  
The question given is the definition of the nucleoside. Therefore, Nucleoside means purine/pyrimidine base+ a sugar which is covalently bonded to the base.

Emmanuel Mumba said: (Sep 23, 2016)  
Doesn't it mean that purine means a base plus a sugar?

Nikhil said: (Nov 9, 2016)  
Nitrogen base is bound to the sugar by the means of glycosidic bond and the glycosidic bond is a covalent bond so either pyrimidine or purine are bound to the sugar by the means of covalently bound glycosidic bond.

B. Genesis Kelly said: (Feb 22, 2018)  
@Emmanuel Mumba.

A purine/pyrimidine is a base while a nucleoside is any of these bases + a pentose sugar. They are bonded by an N-glycosidic bond (nitrogen of base and c1 of sugar).

Rukayya said: (Jul 20, 2018)  
Yes, the sugar is covalently bonded to purine/pyrimidine.

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