What are the four nucleobases found in DNA?

The four nucleobases found in DNA are adenine, thymine, cytosine, and guanine. This is a fundamental aspect of genetics and molecular biology. In the structure of DNA, adenine pairs with thymine and cytosine pairs with guanine, forming the rungs of the double helix ladder structure.

Adenine and thymine are specifically known for their complementary base pairing, while cytosine and guanine also form a strong hydrogen bond to stabilize the DNA structure. This pairing is crucial for accurate DNA replication and transcription processes.

Other choices include uracil, which is found in RNA instead of thymine. In RNA, uracil replaces thymine and pairs with adenine. Therefore, any option that includes uracil does not accurately describe the nucleobases of DNA. The inclusion of uracil in the incorrect options signifies a common misconception regarding the differences between DNA and RNA. Understanding these fundamental differences is important for grasping the molecular basis of genetics and cellular functions.