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18.1 Origin of Life -- Part 4
Today's cells are able to carry on the process of synthesis in order to make the enzymes that allow the copying of genes.
The central dogma of genetics states that there is a direct link between genes and the structure of the human body.
This sequence may have been developed in stages.
The first true cell would have hadRNA genes according to the first hypothesis.
The genes would have directed the process of synthesis.
Ribozymes are a type of RNA molecule.
A number of viruses have genes.
The reverse transcriptase that these viruses use to form DNA is found in the ribonucleic acid.
It is possible that with time, reverse transcription occurred within the cell.
If that was the case, theRNA was responsible for the formation of both genes.
The central dogma of genetics dictated how the synthesis would be carried out.
The ability to synthesise DNA andRNA from small molecule provided by the ocean was only after the creation of a plasma membrane.
It is more likely that the synthesis of nucleotides and then nucleic acids was aided by the use of enzymes.
Once the information was contained within genes, the synthesis would occur.
polypeptides andRNA evolved at the same time.
The first true cell would have contained genes that could have been copied from other cells.
The chicken-and-egg question of whether or not the first riboflavin came first is eliminated.
The two events would have had to happen at the same time.
Before genetic information could be stored, the genetic code had to evolve.
The present genetic code has fewer errors than a million other codes.
The present code is one of the best at reducing the effect of mutations.
A single-base change in a present codon is likely to result in the substitution of a similar amino acid, resulting in minimal changes in the final protein.
Evidence shows that the genetic code underwent a natural selection process before it was finalized.
The stages of the life hypothesis are identified.
List three different hypotheses that explain the origin of organic molecules.
The features of the Protocell Membrane are very different from the features of the modern plasma Membrane.
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