Multiple Choice
In gel electrophoresis, what is the relationship between the size of a DNA fragment and the distance it migrates through the gel?
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7. DNA and Chromosome Structure
DNA Structure
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The sequence 5'-GAACUT-3' may be found in which of the following molecules?
A
A strand of single-stranded DNA
B
A strand of RNA
C
A polypeptide chain
D
A strand of double-stranded DNA
Verified step by step guidance1
Identify the nucleotides present in the sequence 5'-GAACUT-3'. The letters G, A, C, and U represent nucleotides guanine, adenine, cytosine, and uracil respectively.
Recall that DNA contains the bases adenine (A), thymine (T), cytosine (C), and guanine (G), while RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G).
Notice that the sequence contains the base 'U' (uracil), which is found only in RNA and not in DNA.
Since the sequence includes uracil, it cannot be part of either single-stranded or double-stranded DNA, which use thymine instead of uracil.
Conclude that the sequence 5'-GAACUT-3' is found in a strand of RNA, as RNA uniquely contains uracil.
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