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B
TCXU
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C
AGCT
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D
CTAU
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Solution
The correct option is A AGCU
The nucleotide is formed by the union of a phosphate group with nitrogenous base and sugar. The nitrogenous bases are purines and pyrimidines. The purines in RNA are adenine and guanine. The pyrimidines RNA are Uracil and cytosine. These ring structures are known as heterocyclic as they are made of atoms of two elements known as nitrogen and carbon. The purines are double ring structure while the pyrimidines are the single ring made up of carbon and nitrogen. Purines pair with the pyrimidines by hydrogen bonds.