Multiple Choice
Which nitrogenous base is found in DNA but not in RNA?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following lists correctly identifies the four nitrogenous bases found in DNA?
A
Adenine, Thymine, Guanine, Cytosine
B
Adenine, Uracil, Guanine, Cytosine
C
Adenine, Thymine, Guanine, Lysine
D
Adenine, Thymine, Guanine, Uracil
Verified step by step guidance1
Recall that DNA is composed of four nitrogenous bases which are categorized into two groups: purines and pyrimidines.
Identify the purines in DNA: Adenine (A) and Guanine (G).
Identify the pyrimidines in DNA: Thymine (T) and Cytosine (C).
Note that Uracil (U) is found in RNA, not DNA, and Lysine is an amino acid, not a nitrogenous base.
Therefore, the correct list of nitrogenous bases in DNA is Adenine, Thymine, Guanine, and Cytosine.
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