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Multiple Choice
Which nitrogenous base is not found in RNA?
A
Uracil
B
Cytosine
C
Adenine
D
Thymine
Verified step by step guidance
1
Understand the structure of nucleic acids: RNA and DNA are composed of nucleotides, each containing a sugar, a phosphate group, and a nitrogenous base.
Identify the nitrogenous bases in RNA: RNA contains the bases adenine (A), uracil (U), cytosine (C), and guanine (G).
Identify the nitrogenous bases in DNA: DNA contains the bases adenine (A), thymine (T), cytosine (C), and guanine (G).
Compare the bases in RNA and DNA: Notice that RNA contains uracil (U) instead of thymine (T), which is found in DNA.
Conclude which base is not found in RNA: Since thymine (T) is present in DNA but not in RNA, it is the nitrogenous base not found in RNA.