Scelta multipla
A DNA molecule is shaped like a:
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7. DNA and Chromosome Structure
DNA Structure
Scelta multipla
In contrast to RNA, DNA contains which nitrogenous base instead of uracil?
A
Cytosine
B
Thymine
C
Guanine
D
Adenine
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Recall the four nitrogenous bases found in RNA: adenine (A), guanine (G), cytosine (C), and uracil (U).
Recall the four nitrogenous bases found in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T).
Understand that the key difference between RNA and DNA bases is that DNA contains thymine (T) instead of uracil (U), which is found in RNA.
Recognize that thymine pairs with adenine in DNA through two hydrogen bonds, similar to how uracil pairs with adenine in RNA.
Therefore, the nitrogenous base present in DNA but not in RNA, replacing uracil, is thymine.
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