An mRNA macromolecule transcribes genetic code from a DNA macromolecule in a cell’s nucleus and carries the code into the cytoplasm to synthesize a protein.Which of the following statements is true about the nucleotides in the mRNA macromolecule and the DNA macromolecule?

During transcription, mRNA is made complementary to the DNA strand being transcribed. Uracil (U) in the mRNA pairs with adenine (A) on that DNA strand, so their numbers are equal. Therefore, the true statement is that the number of uracil bases matches the number of adenine bases.

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