Question

In a hypothetical stage in the evolutionary history of life on Earth, which self-replicating molecules proliferated before the evolution of all molecules?

• A. RNA
• B. DNA
• C. Prion
• D. Protein

Hint:

RNA world hypothesis: RNA was the first self-replicating molecule.
RNA can store information and catalyze reactions.
Preceded DNA and proteins.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The origin of life involves self-replicating molecules.
The RNA world hypothesis is a proposed model.

Step 2: Key Formula or Approach:
No specific formula.
Need to understand the RNA world hypothesis.

Step 3: Detailed Explanation:
The RNA world hypothesis suggests that RNA was the first self-replicating molecule.
RNA can both store genetic information and catalyze reactions.
Thus, RNA is thought to have proliferated before DNA and proteins.
Prions are infectious proteins.
Therefore, RNA is the correct answer.

Step 4: Final Answer:
RNA molecules proliferated before the evolution of all molecules.
Hence, the correct option is (A).