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The ways to make sure that the bases in the RNA are correctly matched are:

- Make sure the letter T is substituted for the letter U.

- Make sure that A matches U and that C matches G.

Explanation:

In the RNA molecule there are four nitrogenous bases, two purines and two pyrimidines. The purines correspond to Adenine (A) and Guanine (G), while the pyrimidines are Cytosine (C) and Uracil (U), the latter replacing Thymine (T) which is exclusive to the DNA molecule.

During transcription, a purine must be paired with a pyrimidine, so that A is paired with U and G must be paired with C.

This is why in an RNA molecule, the nitrogenous bases are correctly matched when the letter T is substituted for the letter U and A matches U and that C matches G.

Learn more:

Nitrogen bases unique to RNA link