Identify the wrong statement about DNA.

Length of DNA is defined as the number of base pairs present in it

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Cytosine is common to both DNA and RNA

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In a nucleotide, the nitrogenous base is linked to a phosphate group

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Thymine is chemically 5–methyl uracil

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Solution

The correct option is C In a nucleotide, the nitrogenous base is linked to a phosphate group
DNA is made up nucleotides. These nucleotides have the nitrogeneous base which is linked to pentose sugar by N-glycosidic bond and not to a phosphate group.

Length of DNA strand is defined by the number of base pairs present in it which is also a characteristic of an organism. Adenine, guanine, cytosine are common to both DNA and RNA.
Thymine is present only in DNA while uracil is present only in RNA. Interestingly, thymine is chemically 5-methyl uracil.

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