Genetic code is a sequence of 3 letter word, known to be one after the another along the length of the DNA.
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Hypertonic because isotonic is a normal solution and hypotonic means it goes into the cell
Lots of hand waving as is in the current field of much of molecular biology. Other than that experiments and observations. Basically the utilization of the scientific method and then trying to find the mechanism by which something occurs through even more research/experimentation.
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