Imagine That a Researcher Was Able to Travel Back in Time

question 85

Multiple Choice

Imagine that a researcher was able to travel back in time, shortly after the appearance of the first RNAs on Earth. What would she find?

• A)functional ribosomes that behave similarly to those found today
• B)proteins with complex primary, secondary, and tertiary structures
• C)precursors of tRNAs bound to nucleotides, and not amino acids
• D)precursors of tRNAs bound only to specific amino acids, such as glycine
• E)multiple polycistronic mRNAs, which could be translated to generate several proteins

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