The RNA World Hypothesis
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Questions and Answers

What is the primary composition of the ribosome, one of the most critical components of cells?

  • RNA (correct)
  • DNA
  • Proteins
  • Lipids

    • Who proposed the concept of the RNA world?

  • Alexander Rich (correct)
  • Walter Gilbert
  • Both Alexander Rich and Walter Gilbert
  • No one proposed the concept of the RNA world

    • What is the RNA world?

  • A stage in the evolutionary history of life on Earth where all four RNA building blocks were formed concurrently
  • A stage in the evolutionary history of life on Earth where self-replicating RNA molecules proliferated before the evolution of DNA and proteins (correct)
  • A stage in the evolutionary history of life on Earth where RNA enzymes (ribozymes) catalyzed chemical reactions critical for life
  • A stage in the evolutionary history of life on Earth where DNA and proteins proliferated before the evolution of RNA molecules

    • What may be surviving remnants of covalently bound coenzymes in an RNA world?

    <p>Ribonucleotide moieties in many coenzymes</p> Signup and view all the answers

    What ability did some ancient RNAs evolve to protect other RNAs?

    <p>Methylate other RNAs</p> Signup and view all the answers

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