4. What pairs with adenine (A) in the DNA structure? A) Cytosine (C) B) Guanine (G) C) Thymine (T) D) Uracil (U)

In the DNA structure, adenine (A) pairs with thymine (T) through two hydrogen bonds. This complementary pairing is essential for the double helix configuration of DNA, ensuring the stability and accurate replication of genetic information. So the answer to your question is C) Thymine (T)! Now, did you know that the specific pairing of nucleotides is a bit like a lock and key? Adenine can only bond with thymine, just as cytosine (C) pairs with guanine (G). This unique match-up is crucial for the fidelity of DNA replication, which keeps our genetic code safe and sound through generations!