Multiple Choice
Which of the following accurately describes DNA base pairing and the number of hydrogen bonds formed between each pair?
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7. DNA and Chromosome Structure
DNA Structure
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Which nitrogenous base is not found in DNA?
A
Adenine
B
Uracil
C
Guanine
D
Thymine
Verified step by step guidance1
Recall the four nitrogenous bases found in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T).
Understand that DNA is composed of these four bases, which pair specifically: adenine pairs with thymine, and guanine pairs with cytosine.
Recognize that uracil (U) is a nitrogenous base found in RNA, not DNA.
Note that uracil replaces thymine in RNA, pairing with adenine during RNA transcription.
Therefore, identify uracil as the nitrogenous base that is not found in DNA.
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