Humber Admissions Practice Test

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In RNA, which base does adenine pair with?

Thymine
Cytosine
Uracil
Guanine

The correct answer is: Uracil

In RNA, adenine pairs with uracil. This pairing occurs because uracil is structurally similar to thymine, which is found in DNA. However, in RNA, thymine is replaced by uracil. The complementary base pairing in RNA is crucial for various cellular processes, such as protein synthesis, where the sequence of nucleotides in mRNA is translated into amino acids. This pairing ensures that the genetic code is accurately transcribed and interpreted, allowing for proper gene expression. Thus, uracil serves as the counterpart to adenine in the context of RNA.