Which set correctly lists the nitrogenous bases found in RNA?

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

Answer: (B)

Verified step by step guidance

1. Recall that nucleic acids DNA and RNA are composed of nitrogenous bases, sugars, and phosphate groups. The key difference in bases between DNA and RNA lies in one of the pyrimidines.
2. List the four nitrogenous bases found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G).
3. Understand that in RNA, thymine (T) is replaced by uracil (U), so the bases are adenine (A), uracil (U), cytosine (C), and guanine (G).
4. Compare the given options to identify which set contains adenine, uracil, cytosine, and guanine without thymine.
5. Conclude that the correct set of nitrogenous bases found in RNA is the one listing adenine, uracil, cytosine, and guanine.