Which letters represent the four nitrogenous bases found in $DNA$?

• A. $A$, $U$, $C$, $G$
• B. $G$, $C$, $U$, $T$
• C. $A$, $T$, $C$, $G$
• D. $A$, $T$, $C$, $U$

Answer: (C)

Verified step by step guidance

1. Understand that DNA is composed of four nitrogenous bases, which are essential for encoding genetic information.
2. Recall that the four nitrogenous bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).
3. Recognize that uracil (U) is not found in DNA; it is present in RNA instead, where it replaces thymine.
4. Identify the correct set of letters representing the nitrogenous bases in DNA as A, T, C, and G.
5. Review the options provided and select the one that correctly lists the DNA bases: A, T, C, G.