Which of the following sets represents the most likely sequence of events in the origin of life on Earth?

• A. Formation of protocells → Abiotic synthesis of organic molecules → Origin of self-replicating molecules
• B. Origin of self-replicating molecules → Formation of protocells → Abiotic synthesis of organic molecules
• C. Abiotic synthesis of organic molecules → Origin of self-replicating molecules → Formation of protocells
• D. Abiotic synthesis of organic molecules → Formation of protocells → Origin of self-replicating molecules

Answer: (C)

Verified step by step guidance

1. Understand the context: The question is about the sequence of events in the origin of life on Earth, which involves key processes such as abiotic synthesis, self-replication, and protocell formation.
2. Step 1: Begin with abiotic synthesis of organic molecules. This refers to the formation of simple organic compounds (e.g., amino acids, nucleotides) from inorganic precursors under prebiotic conditions. These molecules are essential building blocks for life.
3. Step 2: Next, consider the origin of self-replicating molecules. Self-replicating molecules, such as RNA, are crucial for storing and transmitting genetic information, enabling the process of evolution and the emergence of life.
4. Step 3: Finally, examine the formation of protocells. Protocells are membrane-bound structures that can encapsulate organic molecules, creating a controlled environment for chemical reactions and the development of primitive cellular functions.
5. Step 4: Recognize that the correct sequence is: Abiotic synthesis of organic molecules → Origin of self-replicating molecules → Formation of protocells. This sequence reflects the logical progression from simple chemical building blocks to more complex structures capable of life-like processes.