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Question

In the polynucleotide chain of DNA, a nitrogenous base is linked to the OH of:

A
2'C pentose sugar
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B
3'C pentose sugar
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C
5'C pentose sugar
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D
1'C pentose sugar
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Solution

The correct option is D 1'C pentose sugar
DNA is a polynucleotide chain made up of several nucleotides.

The nucleotide is the basic fundamental unit of DNA.

The nucleotide of DNA is made up of three components.

1. 5-carbon sugar (deoxyribose sugar)
2. Nitrogenous base (purine or pyrimidine)
3. Phosphate group

The nitrogenous base is linked to the pentose sugar through a N-glycosidic linkage at 1'C pentose sugar forming a nucleoside. (The carbon atoms in the pentose sugar are numbered as 1′, 2′, 3′, 4′, and 5′).

Fig: Nucleoside

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