Question

Select the INCORRECT statement regarding RNA world hypothesis.

• A. RNA can self replicate via ribozymes.
• B. RNA catalyses protein synthesis.
• C. Varieties of RNA are formed due to mutation of RNA.
• D. RNA is the only stable genetic material, which is responsible for rich biodiversity on earth.

Hint:

Evolution idea: RNA came first, but DNA replaced it due to greater stability.

Answer 1

The Correct Option is D

Concept:
RNA world hypothesis suggests that early life forms used RNA as both genetic material and catalytic molecule before DNA evolved.

Step 1: Analyze Statement A. RNA molecules (ribozymes) can catalyze reactions and may have self-replicating abilities. \checkmark

Step 2: Analyze Statement B. RNA plays a role in protein synthesis (e.g., rRNA, tRNA, mRNA). \checkmark

Step 3: Analyze Statement C. Mutations in RNA can generate diversity in early molecular systems. \checkmark

Step 4: Analyze Statement D. RNA is not the most stable genetic material; DNA later evolved as a more stable molecule responsible for heredity and biodiversity. Thus, statement (D) is incorrect.

Step 5: Conclusion. \[ \text{Incorrect statement = RNA is the only stable genetic material} \]