Multiple Choice
Which of the following is a unique feature of the nitrogenous bases found in RNA compared to DNA?
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7. DNA and Chromosome Structure
RNA
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Which of the following provides evidence that RNA probably evolved before DNA?
A
RNA can act as both a genetic material and as a catalyst in biochemical reactions.
B
DNA is more chemically reactive than RNA.
C
RNA contains thymine instead of uracil.
D
Proteins are required for RNA synthesis but not for DNA synthesis.
Verified step by step guidance1
Understand the question is asking for evidence supporting the hypothesis that RNA evolved before DNA in the origin of life.
Recall that one key feature of RNA is its ability to serve dual functions: it can store genetic information and also catalyze biochemical reactions, acting like an enzyme (ribozymes).
Compare this to DNA, which primarily serves as a stable genetic material but does not have catalytic activity.
Evaluate the answer choices by considering which statement highlights RNA's unique dual role, supporting its early evolutionary role.
Conclude that the statement 'RNA can act as both a genetic material and as a catalyst in biochemical reactions' provides the strongest evidence for RNA evolving before DNA.
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