In DNA, which base pairs with Adenine?

In DNA, which base pairs with Adenine?

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

Answer: (C)

In DNA, base pairing follows specific complementary rules: adenine pairs with thymine, and cytosine pairs with guanine. This A–T pairing is favored because adenine is a purine and thymine is a pyrimidine, so they fit together with the same width as a C–G pair, maintaining a uniform double-helix structure. They form two hydrogen bonds, which helps stabilize the DNA molecule. This pairing is essential for accurate replication and transcription. In RNA, thymine is replaced by uracil, which pairs with adenine in the same way. So thymine is the partner for adenine in DNA.

In DNA, base pairing follows specific complementary rules: adenine pairs with thymine, and cytosine pairs with guanine. This A–T pairing is favored because adenine is a purine and thymine is a pyrimidine, so they fit together with the same width as a C–G pair, maintaining a uniform double-helix structure. They form two hydrogen bonds, which helps stabilize the DNA molecule. This pairing is essential for accurate replication and transcription. In RNA, thymine is replaced by uracil, which pairs with adenine in the same way. So thymine is the partner for adenine in DNA.