Name the four nitrogenous bases found in DNA.

The four nitrogenous bases found in DNA are adenine, thymine, cytosine, and guanine. DNA is a double-stranded molecule, and its structure is based on the pairing of these bases: adenine pairs with thymine, and cytosine pairs with guanine. This complementary base pairing is essential for DNA replication and contributes to the stability of the DNA structure.

Each of the bases plays a critical role in the encoding of genetic information. Adenine and guanine are classified as purines, while thymine and cytosine are pyrimidines. The specific ordering of these bases along the DNA strand determines the genetic instructions for organisms, making them fundamental to the study of genetics.

In contrast, options that include uracil are related to RNA, rather than DNA. RNA incorporates uracil in place of thymine, which distinguishes it from DNA. Similarly, mentions of ribose appear in references to RNA molecules, where ribose serves as the sugar component, whereas DNA contains deoxyribose. Thus, the listing of thymine, cytosine, and guanine alongside ribose does not match the components of DNA.