Which of the following is NOT a nitrogenous base found in DNA?

Uracil is the correct choice as it is not a nitrogenous base found in DNA. Instead, uracil is a nitrogenous base that is present in RNA. In DNA, the nitrogenous bases consist of adenine, thymine, cytosine, and guanine. Each of these molecules plays a critical role in the genetic coding and structure of DNA, where adenine pairs with thymine and cytosine pairs with guanine. The presence of uracil in RNA, instead of thymine, highlights a fundamental difference between these two nucleic acids, which is important for various cellular processes such as protein synthesis.