RNA World, Definition, Hypothesis, and Significance
RNA World, Discover the RNA World, its definition, hypothesis, and significance in the origin of life. Understand its role in evolution, essential for NEET exam preparation.
Krati Saraswat5 Jun, 2025
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RNA World is a hypothesis that explains the origin of life on Earth. It suggests that RNA, a molecule similar to DNA , was the first self-replicating and functional molecule before DNA and proteins became essential components of life. This topic is significant for the NEET Exam as it helps explain the molecular basis of life and the evolutionary history of biological systems, which are key topics in the NEET biology syllabus .
Definition of RNA World
The RNA World refers to a hypothetical stage in the early history of life when RNA molecules were the primary carriers of genetic information and also acted as catalysts for chemical reactions. In this stage, RNA was believed to have dual functions, performing the roles of both genetic material and enzymes. This idea helps explain how life could have originated from non-living chemical substances.RNA World Hypothesis
The RNA World Hypothesis proposes that life began with RNA molecules, which served dual roles: storing genetic information and performing catalytic functions. Unlike DNA, which relies on proteins for replication and function, RNA is unique in its ability to act as both a carrier of genetic codes and as an enzyme-like molecule, known as a ribozyme . This hypothesis is supported by the discovery of ribozymes, which demonstrate that RNA can catalyze reactions, such as the formation of peptide bonds during protein synthesis. It is believed that over time, DNA and proteins evolved to take over RNA's functions, leading to the complex cellular systems we see today.Significance of RNA World
The RNA World Hypothesis is significant because it provides a plausible explanation for the origin of life. It bridges the gap between simple chemical molecules and complex living organisms by showing how RNA can perform essential functions necessary for life. Understanding the RNA World also highlights the evolutionary process that led to the development of modern genetic and biochemical systems, offering insights into the molecular evolution of life on Earth.MCQs of RNA World
Q1. Select the wrong statement;
- DNA stores genetic information.
- There is now enough evidence that essential processes like metabolism, translation and splicing evolved around RNA.
- DNA may act as a catalyst.
- RNA can splice itself and is also able to act as a Catalyst.
Q2. Statement-I: DNA being more stable is preferred for the storage of genetic information and for the transmission of genetic information RNA is better.
Statement-II: RNA can directly code for the synthesis of proteins and hence can express characters.
- Statement I and Statement II both are correct.
- Statement I is correct but Statement II is incorrect.
- Statement I is incorrect but Statement II is correct.
- Statement I and Statement II both are incorrect.
Q3. Which one of the following is not applicable to RNA?
- 5' phosphoryl and 3' hydroxyl ends
- Heterocyclic nitrogenous bases
- Chargaff's rule
- Ribose sugar
Also Check:
- Free Toppers Notes for NEET
- Free NEET Lectures by PW Faculties
- NEET Study Material, Free Sample Papers, Book, Toppers Notes, PYQs
Answers of MCQs of RNA World
Ans1. DNA may act as a catalyst., Ans2. Statement-I and Statement-II both are correct., Ans3. Chargaff's rule Unlock your potential with Physics Wallah's NEET coaching ! Our educators provide comprehensive study materials, interactive classes, and personalized guidance to help you excel in your NEET exams.| NEET Exam Important Links | |
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RNA World FAQs
Q. What is meant by RNA World?
Ans. The RNA World refers to a hypothetical stage in Earth's early history when RNA molecules acted as both genetic material and enzymes, playing a central role in the origin of life.
Q. What is the RNA world vs DNA world?
Ans. The RNA World represents an early phase of life when RNA molecules were responsible for both genetic information and catalysis. The DNA World refers to the modern biological system where DNA stores genetic information and proteins act as catalysts.
Q. Which statement best describes the RNA world theory?
Ans. The RNA World theory describes a stage in early evolution where RNA molecules were the key players in carrying genetic information and catalyzing biochemical reactions.
Q. What is RNA full form?
Ans. Yes, RNA stands for Ribonucleic Acid, a molecule essential for genetic functions and protein synthesis.
Q. What is the 5 of RNA?
Ans. The "5" in RNA refers to the 5' end of the molecule, which has a phosphate group attached. This end is significant in molecular processes like transcription and translation.
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