Science Olympiad Designer Genes Practice Exam

Which base pairs with Adenine in DNA?

Cytosine Thymine Guanine Uracil

Correct Answer:

Thymine

Explanation:

In DNA, adenine pairs specifically with thymine. This pairing occurs due to the hydrogen bonding between the two bases: adenine, which is a purine, forms two hydrogen bonds with thymine, a pyrimidine. This complementary base pairing is essential for the structure of DNA, contributing to the double helix formation and ensuring accurate replication during cell division. While cytosine and guanine can also be paired together, they do not interact with adenine. Similarly, uracil is found in RNA, where it pairs with adenine, but it is not present in DNA. Thus, thymine is the correct base that pairs with adenine in the context of DNA.

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