Question

Which of the following is the correct sequence of events in the origin of life?

I. Formation of protobionts
II. Synthesis of organic monomers
III. Synthesis of organic polymers
IV. Formation of DNA-based genetic systems

• A. II, III, IV, I
• B. II, III, IV, I
• C. I, III, II, IV
• D. II, III, I, IV
  

Answer 1

The correct option is D II, III, I, IV


Haldane and Oparin put forward their ideas regarding the origin of life on the earth. Their hypothesis is called the theory of chemical evolution.

According to them, the various sequence of events in the origin of life are as follows:

Chemical reactions between gases and other inorganic molecules led to the formation of simple organic monomers like amino acids and nucleotides.

The simple organic monomers combined to form large complex organic molecules (polymers). The polymerisation of amino acids to form proteins is one such example.

These organic polymers aggregated and it led to the formation of protobionts (the first non-cellular forms of life).

The protobionts eventually evolved into the first cellular forms of life with DNA based genetic systems.

Hence, the correct sequence of events is:


Option D is the correct answer.