In DNA base pairing, adenine bonds with which nucleotide?

• A. Cytosine
• B. Thymine
• C. Guanine
• D. Uracil

Answer: (B)

In DNA base pairing, adenine specifically bonds with thymine. This pairing is due to the complementary nature of the nitrogenous bases, where adenine forms two hydrogen bonds with thymine. This base pairing is a key feature of DNA's double helix structure, allowing the strands to stabilize and maintain their helical shape.

Understanding that adenine pairs exclusively with thymine (as opposed to other bases like cytosine, guanine, or uracil) is crucial for grasping the mechanisms of DNA replication and transcription, processes that are foundational to genetics. In DNA, these specific pairings ensure accurate copying and transmission of genetic information during cell division and throughout generations.