Multiple Choice
What do the two strands of DNA join together to form?
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7. DNA and Chromosome Structure
DNA Structure
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Which nitrogenous base is found in DNA but not in RNA?
A
Cytosine
B
Thymine
C
Uracil
D
Adenine
Verified step by step guidance1
Recall the four nitrogenous bases found in DNA: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).
Recall the four nitrogenous bases found in RNA: Adenine (A), Uracil (U), Cytosine (C), and Guanine (G).
Compare the bases in DNA and RNA to identify which base is unique to DNA and absent in RNA.
Note that Thymine (T) is present in DNA but replaced by Uracil (U) in RNA.
Conclude that the nitrogenous base found in DNA but not in RNA is Thymine.
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