Multiple Choice
Which base is found only in RNA and not in DNA?
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7. DNA and Chromosome Structure
RNA
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Which of the following sequences represents a strand of RNA bases?
A
uggcucgaa
B
gttagtgcc
C
tggctcgaa
D
caatctagg
Verified step by step guidance1
Recall that RNA sequences are composed of the bases adenine (A), uracil (U), cytosine (C), and guanine (G). Unlike DNA, RNA contains uracil (U) instead of thymine (T).
Examine each given sequence and identify the bases present. Look specifically for the presence of uracil (U) and the absence of thymine (T).
The sequence that contains 'u' (uracil) and does not contain 't' (thymine) is the RNA sequence.
For example, the sequence 'uggcucgaa' contains 'u' and no 't', indicating it is an RNA strand.
The other sequences contain 't', which is characteristic of DNA, so they are not RNA sequences.
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