What are the four bases found in DNA?

The correct answer identifies the four nitrogenous bases found in DNA, which are adenine, guanine, cytosine, and thymine. These bases are the building blocks of DNA and play a crucial role in genetic encoding. Adenine pairs with thymine, and guanine pairs with cytosine, forming the rungs of the DNA double helix structure.

In the context of DNA, uracil is not present; it is found in RNA instead, which accounts for the incorrect options that include uracil. Understanding the composition of DNA, including these specific bases, is fundamental when studying genetics and molecular biology, making the identification of adenine, guanine, cytosine, and thymine essential knowledge for any laboratory animal technologist.