.......... base is found in RNA but not in DNA.

Uracil

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Adenine

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Cytosine

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Thymine

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Guanine

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Solution

The correct option is A Uracil
Uracil is among the five nitrogenous bases like adenine, guanine, cytosine, and thymine,but is only found in RNA. It is a naturally occurring pyrimidine derivative with the molecular formula C₄H₄N₂O₂. Uracil is planar and unsaturated and has the ability to absorb light. It binds to adenine via 2 hydrogen bonds but is replaced by thymine in DNA.
So, the correct answer is option A.

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