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Which of the following provides evidence that RNA probably evolved before DNA?
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7. DNA and Chromosome Structure
RNA
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Which structural feature is shared by both DNA and RNA molecules?
A
They both contain the nitrogenous base thymine.
B
They both have deoxyribose as their sugar.
C
They both contain a phosphate backbone.
D
They are both typically double-stranded.
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Identify the main structural components of nucleic acids: sugar, phosphate group, and nitrogenous bases.
Recall that DNA contains deoxyribose sugar, while RNA contains ribose sugar, so they do not share the same sugar.
Remember that thymine is a nitrogenous base found only in DNA; RNA contains uracil instead of thymine.
Understand that both DNA and RNA have a backbone made of alternating sugar and phosphate groups, which is called the phosphate backbone.
Note that DNA is typically double-stranded, whereas RNA is usually single-stranded, so this feature is not shared.
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