The History of Life on Earth

Conditions on early Earth made the origin of life possible

This is how the first cells appeared:

1.Nonliving or abiotic processes create small organic molecules, like amino acids and nitrogenous bases

2. These small molecules form macromolecules, like amino acids and nucleic acids

3. These macromolecules are packaged into protocells, which can have a different chemistry than the rest of the surroundings

4. These protocells developed the ability to self-replicate

Synthesis of Organic Compounds on Early Earth

It was formulated that the organic compounds originally thought to be present at the beginning of earth were actually made of simpler molecules such as carbon and nitrogen. These simple molecules synthesized through the energy released by lightning and UV radiation to make organic molecules and amino acids. This hypothesis was tested through the Miller-Urey experiment.

Every cell needs macro molecules including enzymes. Macro-molecules are questioned if they existed since the early days of earth. Simply by dripping solutions of amino acids on to clay or rock. This was without any need of an enzyme which is thought to be how the earth did it before.