Which nitrogenous bases are found in the structure of DNA?

• A. Adenine, Thymine, Cytosine, Uracil
• B. Adenine, Uracil, Cytosine, Guanine
• C. Adenine, Thymine, Cytosine, Guanine
• D. Adenine, Guanine, Cytosine, Uracil

Answer: (C)

Verified step by step guidance

1. Understand that DNA is composed of four nitrogenous bases that pair up to form the rungs of the DNA ladder.
2. Recall that the nitrogenous bases in DNA are divided into two categories: purines and pyrimidines.
3. Identify the purines in DNA, which are Adenine (A) and Guanine (G).
4. Identify the pyrimidines in DNA, which are Thymine (T) and Cytosine (C).
5. Note that Uracil (U) is not found in DNA; it is found in RNA instead, replacing Thymine.