Multiple Choice
Which of the following terms is used to describe catalytically active RNA molecules?
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7. DNA and Chromosome Structure
RNA
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Which of the following lists correctly identifies the four nitrogenous bases found in RNA?
A
Adenine, Guanine, Thymine, Cytosine
B
Adenine, Uracil, Cytosine, Thymine
C
Adenine, Uracil, Cytosine, Guanine
D
Adenine, Thymine, Cytosine, Guanine
Verified step by step guidance1
Recall that RNA (ribonucleic acid) is composed of four nitrogenous bases, which are the building blocks of its nucleotide structure.
Identify the purine bases in RNA: Adenine (A) and Guanine (G). These are larger, double-ring structures.
Identify the pyrimidine bases in RNA: Cytosine (C) and Uracil (U). Note that Uracil replaces Thymine in RNA, which is found only in DNA.
Compare the given options and check which list contains Adenine, Guanine, Cytosine, and Uracil, without Thymine.
Conclude that the correct list of nitrogenous bases in RNA is Adenine, Uracil, Cytosine, and Guanine.
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