Which of the following are the four bases of DNA?

The correct answer lists the four bases of DNA as Adenine, Thymine, Cytosine, and Guanine. These four nucleobases are fundamental components of DNA, which is a double helix structure made up of long chains of nucleotides. Each nucleotide consists of a phosphate group, a sugar molecule (deoxyribose in DNA), and one of the four nitrogenous bases.

In DNA, Adenine pairs with Thymine, and Cytosine pairs with Guanine through complementary base pairing. This pairing is crucial for the structure of DNA and for processes such as DNA replication and transcription. Understanding these bases and their specific pairings is essential for studying genetics and molecular biology, highlighting their role in heredity and the functioning of living organisms.

The other choices include bases that are not found in DNA or mix DNA with RNA components, such as Uracil, which is a component of RNA, not DNA. Additionally, RNA is mentioned in one of the options, which does not pertain to the bases of DNA and leads to confusion about the fundamental structure of DNA itself.