Which set correctly lists the four nitrogenous bases found in DNA?

• A. Adenine, thymine, cytosine, guanine
• B. Thymine, uracil, cytosine, guanine
• C. Adenine, uracil, cytosine, guanine
• D. Adenine, thymine, cytosine, uracil

Answer: (A)

Verified step by step guidance

1. Recall that DNA is composed of four nitrogenous bases, which are divided into two categories: purines and pyrimidines.
2. Identify the purines in DNA: adenine (A) and guanine (G).
3. Identify the pyrimidines in DNA: cytosine (C) and thymine (T).
4. Note that uracil (U) is not found in DNA; it is found in RNA instead, replacing thymine.
5. Therefore, the correct set of nitrogenous bases in DNA is adenine, thymine, cytosine, and guanine.