Why the genetic code is composed of only 4 bases? Not 5 or 6 or more? Or even less? Is it because that the number 4 is the first non prime even number useful for pairing? More mysteriously, these bases can only pair exclusively with one another. A - Always with T, and C - always with G. Why nature always chooses opposite pairs for stability and equilibrium? Negative electrons orbit positive nuclei, stable diatomic molecules, noble gases, binary stars, etc.


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