Question

The first non- cellular forms of life that
could have originated 3 billion years back
were giant molecules of
(A) Protein
(B) Polysaccharide
(C) RNA
(D) All of these​

Answer 1

Answer:

Answer:Origin of first cell: • The first non-cellular forms of life may originated 3 billion years back. They have been giant molecules like RNA, proteins, Polysaccharides etc. These molecules aggregates to form protobionts.

Answer 2

THE FIRST NON-CELLULAR FORMS OF LIFE

Explanation:

Oparin and Haldane Theory

• According to Oparin and Haldane, the initial form of life evolved from non-living organic molecules such as RNA and protein. They proposed that chemical evolution led to the emergence of life. During the process of chemical evolution, a variety of organic molecules were synthesized from inorganic constituents.  

Miller Experiment:    

• Miller developed an atmosphere in the lab that was identical to that which existed 4 billion years ago on Earth. CH4, H2, NH3, and water vapor are pumped into a sealed tank. In the tank, they developed an electric discharge of 800°C.
• Miller noted the formation of amino acids. Other scientists also observed the formation of a nitrogenous base, sugar, color, and fat.
• These experiments confirmed the Oparin and Haldane hypothesis. As a result, chemical evolution became a widely accepted theory of life's origin.

The first non-cellular form of life:

• Around 3 billion years ago, non-cellular life might have originated; in the form of giant molecules, such as RNA, protein, or polysaccharides.

• According to most accepted theories on the origin of life on earth, the first cellular form of life probably did not appear until about 2000 million years ago. The above experiment proved that the first life on earth evolved from non-living molecules.