Question

Why do people think RNA came before DNA?

Answer 1

The hypothesis that RNA preceded DNA is rooted in the RNA World Hypothesis, suggesting that RNA played a dual role in storing genetic information and catalyzing reactions in early life. RNA's simplicity, prevalence, and chemical properties, along with its potential involvement in early replication mechanisms, contribute to the idea that it may have been a precursor to DNA in the evolutionary history of life on Earth. This theory is part of ongoing scientific exploration into the origins of genetic systems.

Answer 2

The RNA world hypothesis proposes that RNA came before DNA and proteins, and was the first organic molecule to evolve. RNA can encode genetic information and perform chemical reactions, making it a versatile molecule. Evidence suggests that RNA may be the oldest of the organic molecules.

Step-by-step explanation:

The RNA world hypothesis suggests that RNA may have been the first organic molecule to evolve and that early life was based on RNA before DNA and proteins. RNA can encode genetic instructions like DNA and can also carry out chemical reactions like proteins, making it a versatile molecule. Some scientists believe that RNA came before DNA because it solves the question of which molecule came first and there is evidence suggesting that RNA is the most ancient of the organic molecules.