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The Origins of Life and Precambrian Evolution The first three choices are all correct. In one or two brief sentences, give your own interpretation of what Gerald Joyce meant when he wrote that "Once an RNA enzyme with RNA replicase activity is in hand, the dreaming stops and the fun begins." To create paragraphs in your essay response, type < p > at the beginning of the paragraph, and < /p > at the end.

Answer 1

This is to prove that RNA existed before the DNA did. He meant that if the RNA enzyme could replicate the RNA molecules then it can do the magic because the evolution would operate in self sustainable manner. The enzyme would generate each copies of themselves and if the NTP sources were given indefinite then the low fidelity of RNA enzyme would produce mutation. The evolving population of RNA enzymes would develop specificity for substrates that resemble themselves, and to replicate those substrates with increasing efficiency and fidelity. Evolutionary innovation would continue so long as selectively advantageous mutations were obtainable.