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List three main differences between DNA and RNA.
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7. DNA and Chromosome Structure
RNA
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Which of the following is a unique feature of the nitrogenous bases found in RNA compared to DNA?
A
RNA contains uracil instead of thymine.
B
RNA contains all four bases found in DNA without any differences.
C
RNA contains the base cytosine instead of guanine.
D
RNA contains deoxyribose instead of ribose.
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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 any differences. Notice that RNA contains uracil (U) instead of thymine (T), which is found in DNA.
Understand that the sugar component differs between DNA and RNA: DNA contains deoxyribose, while RNA contains ribose. However, this difference is in the sugar, not the nitrogenous bases.
Conclude that the unique feature of nitrogenous bases in RNA compared to DNA is the presence of uracil instead of thymine.
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