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It has been proposed that the first cells used RNA for both information storage and catalysis and that DNA and proteins evolved later. Which modern macromolecules may be relics of the hypothesized RNA world

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Answer:One view is that an RNA world existed on Earth before modern cells arose (Figure 6-91). According to this hypothesis, RNA stored both genetic information and catalyzed ... Only later in evolutionary time did DNA take over as the genetic material and ... It has been proposed that the first “biological” molecules on Earth.

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