Which bases are part of the DNA structure?

The correct option includes the bases that are fundamental components of DNA structure. In DNA, the four nitrogenous bases are adenine, cytosine, guanine, and thymine. These bases pair specifically—adenine pairs with thymine, and cytosine pairs with guanine—forming the rungs of the DNA ladder structure.

The structure of DNA comprises two long strands that weave around each other to form a double helix, where these bases are pivotal in encoding genetic information. Understanding the specific roles and pairs of these bases is crucial for grasping how genetic information is stored and transmitted across generations.

The inclusion of uracil in some options indicates a misunderstanding, as it is a base found in RNA, not DNA. Similarly, ribose is the sugar component of RNA and not part of DNA, which contains deoxyribose instead.