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JKCET RNA World — practice questions

Explore 2 free RNA World questions in JKCET Biology. Open each question or exercise to read its content, reference answers and available explanation.

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RNA World questions and exercises with answers

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The **RNA World Hypothesis** suggests that the earliest life was based on:Read the answer and worked solution →**Ribozymes** are:Read the answer and worked solution →

Worked practice questions

The **RNA World Hypothesis** suggests that the earliest life was based on:

  1. DNA only
  2. Proteins only
  3. RNA (which acts as both genetic material and catalyst)
  4. Lipid membranes only
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Correct answer: C. RNA (which acts as both genetic material and catalyst)

Hypothesis (Carl Woese, Crick, Orgel) supported by discovery of **ribozymes** — catalytic RNAs (Altman, Cech, 1980, Nobel 1989). RNA can both store information and catalyse reactions ribosomes are RNA-catalysed. DNA evolved later as a more stable repository.

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**Ribozymes** are:

  1. DNA molecules with enzymatic activity
  2. Catalytic RNA molecules — evidence for RNA World hypothesis
  3. Protein enzymes that synthesise RNA
  4. DNA-binding proteins
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Correct answer: B. Catalytic RNA molecules — evidence for RNA World hypothesis

Ribozymes are catalytic RNAs (e.g. self-splicing introns in *Tetrahymena*, RNase P, ribosomal peptidyl transferase). Discovered independently by Altman and Cech (Nobel Prize 1989). Their existence strongly supports the RNA-World hypothesis.

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