1.

Cytosine, Thymine and Uracil are similar with respect to

Answer»

`C=O` at 2nd POSITION in pyrimidine ring 
`NH_(2)` group at 4th carbon in pyrimidine ring 
`C=O` at 4th position in pyrimidine ring
absence of `C=O` group at 2nd position in pyrimidine ring 

ANSWER :A


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