Polynucleotide chain of DNA contains

a nitrogenous base, deoxyribose sugar and phosphate group

a nitrogenous base, ribose sugar and phosphate group

deoxyribose sugar, ribose sugar and phosphate group

a nitrogenous base and phosphate group only

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This question was previously asked in

UPSC CDS-1 – 2017

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A polynucleotide chain of DNA is a polymer made up of repeating units called nucleotides. Each DNA nucleotide consists of three components: a nitrogenous base (Adenine, Guanine, Cytosine, or Thymine), a deoxyribose sugar (a five-carbon sugar lacking an oxygen atom at the 2′ position), and a phosphate group. These nucleotides are linked together by phosphodiester bonds between the sugar of one nucleotide and the phosphate group of the next.

Understanding the basic building blocks of DNA (nucleotides) and their components is fundamental to molecular biology.

RNA differs from DNA in that it contains ribose sugar instead of deoxyribose sugar and the nitrogenous base Uracil (U) instead of Thymine (T). Both DNA and RNA contain Adenine (A), Guanine (G), and Cytosine (C).

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