Multiple Choice
DNA coils tightly and assembles into visible structures during cell division. What are these structures called?
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7. DNA and Chromosome Structure
DNA Structure
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Which nitrogenous base is unique to RNA, and which is unique to DNA?
A
Adenine is unique to RNA; cytosine is unique to DNA.
B
Uracil is unique to RNA; thymine is unique to DNA.
C
Thymine is unique to RNA; uracil is unique to DNA.
D
Guanine is unique to RNA; adenine is unique to DNA.
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).
Identify which base is present in RNA but not in DNA. This base is uracil (U), which replaces thymine in RNA.
Identify which base is present in DNA but not in RNA. This base is thymine (T), which is replaced by uracil in RNA.
Conclude that uracil is unique to RNA, and thymine is unique to DNA.
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