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Throughout our biochemistry, a small but
important molecule appears attached to the sides of its much more prominent
peers. These phosphates are very energetic, and are simply "discarded"
after use.

Such batteries are quite handy to life, as they
can be readily added to or subtracted from another molecule, often being passed
around like a hot potato.
But one doesn't want the battery adding energy
when they don't want a "change" to occur. When we store things, we
tend to keep them from change, by placing them somewhere cool, for
example : "cool" means "less energy" - an off switch. When a
section of DNA is "cool", it is a program without action. At this
stage, it is merely data...
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