What types of nucleotides are included in DNA?

DNA consists of four specific types of nucleotides, which are the building blocks of the nucleic acid. These nucleotides include adenine, thymine, cytosine, and guanine. Adenine and thymine pair with each other, as do cytosine and guanine, forming the rungs of the helical structure of DNA. This pairing is fundamental to the structure of DNA, as it allows for the formation of the double helix.

The presence of uracil in some of the answer choices is significant because uracil is a nucleotide found in RNA, not DNA. In RNA, uracil replaces thymine. This distinction is crucial in understanding the differences between DNA and RNA, as they perform different roles in the cell. The option that correctly identifies the nucleotides present in DNA excludes uracil and includes thymine, making it the only accurate choice among the options provided.