The most interesting thing about many protein moleculesby (Premier Login iorr5t)
is their shape. They might have a given shape and, when they run across a potassium ion, they twist to a different shape.
Some other ion will twist them back. So in a way, they are the basis of memory.
Primitive cells use this to remember which direction they are moving so they can determine if it is toward food or away from enemies or poisons.
The basis, eventually, for brain cells.
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