And also, if the precursor molecules might have existed in the Early Earth the proteins might have, because proteins are a necessity for life. Life can not exist with out proteins, and Miller and Urey thought that proteins might have existed as well (BSCS, LBE, MP).
In 1986, the tail of the comet Halley passed near the Earth (BSCS). In it, scientists detected the presence of formaldehyde. This is quite interesting, because formaldehyde is needed for the formation of ribose in R.N.A (BSCS, MP) If the comet hit the earth, then it must have brought precursor molecules (amino acids) to the earth. How did it get here? Well, precursor molecules formed away from the earth. But, if formaldehyde is a building block for R.N.A, then why is R.N.A so important? Information from proteins is passed from DNA to RNA in modern cells (BSCS). Amino acids (precursor molecules) may have existed in the atmosphere of Early Earth, and may have joined to form proteins, but the thing is, proteins can not replicate themselves without RNA. So if there was RNA, then there was formaldehyde because it might have been passed down to earth from the atmosphere from Halley's comet by crashing into it. .
Biological materials are living molecules that can survive their own way. They consist of three processes: self reproduction, mutation (genetic change)that can be inherited, and natural selections (BSCS). In order for something to believing, a substance has to be able to reproduce itself, it has to be able to subject itself to mutations that can be passed onto its offspring, and of course subject to natural selections (BSCS). .
These abilities were theorized to have developed by the first life forms being cell - like structures enclosed in a water membrane, or a coacervate. Coacervates are clusters of proteins or protein - like substances held together in small droplets within a surrounding liquid (BSCS). Carl Woese, a scientist, produced a model for the formation of the first cells (BSCS).