In RNA, which nitrogenous base is present that is not found in DNA?

• A. Thymine (T)
• B. Cytosine (C)
• C. Uracil (U)
• D. Adenine (A)

Answer: (C)

Verified step by step guidance

1. Understand the basic structure of nucleic acids: DNA and RNA are both made up of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base.
2. Recall that DNA contains four nitrogenous bases: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
3. Recall that RNA also contains four nitrogenous bases, but instead of Thymine (T), it contains Uracil (U) along with Adenine (A), Cytosine (C), and Guanine (G).
4. Recognize that Uracil (U) is unique to RNA and replaces Thymine (T) found in DNA.
5. Therefore, the nitrogenous base present in RNA but not in DNA is Uracil (U).