Humber Admissions Practice Test

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Which base pairs with thymine in DNA?

Cytosine
Adenine
Guanine
Uracil

The correct answer is: Adenine

Thymine is one of the four nucleotide bases found in DNA, and it specifically pairs with adenine through hydrogen bonding. In the double helix structure of DNA, thymine and adenine are complementary bases, meaning that they fit together to stabilize the structure of the DNA molecule. This pairing is essential for the processes of DNA replication and transcription, where the accurate transmission of genetic information relies on these specific base pairings. Adenine has a double bond with thymine, forming A-T pairs. This is a foundational concept in molecular biology that underpins the mechanisms of heredity and gene expression. Understanding this base pairing is critical as it demonstrates the rules of complementary base pairing that dictate the integrity of genetic information.