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Q.
The base found only in the nucleotldes of $RNA$, is
AFMCAFMC 2009Biomolecules
Solution:
Nucleotide contains sugar $+$ base $+$ phosphate. The base present in RNA are adenine; guanine, uracil and cytosine while the base present in DNA are adenine, guanine, thymine and cytosine.
Hence, uracil is the base which is found only in the nucleotide of RNA.