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Question

A short length of double stranded DNA molecule contains 120 adenine and 120 cytosine Bases. The total number of nucleotides in this DNA fragment is


A

60

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B

120

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C
240
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D

480

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Solution

The correct option is D

480


Nucleotides are organic molecules that serve as the monomers, or subunits, of nucleic acids like DNA and RNA. The building blocks of nucleic acids, nucleotides are composed of a nitrogenous base, a five-carbon sugar (ribose or deoxyribose), and at least one phosphate group.

In case of DNA nitrogenous bases are adenine (A), guanine(G), cytosine(C) and thymine(T), Where A pairs with T and C pairs with G. In the problem 120 A pairs with 120 T and 120 C pairs with 120 G. So the total number of nucleotides are (120A+120T+120C+120G) 480.


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