Which of the following is NOT a nitrogen base of nucleotides present in plasmid DNA?
A
Thymine
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B
Cytosine
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C
Uracil
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D
Adenine
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Solution
The correct option is D Uracil Uracil is not a nitrogen base of nucleotides present in plasmid DNA because it is only present in RNA as uridine but is replaced by thymidine in DNA .