It's npn, as I said, because there was a positively charged iron sulfur cluster between two negatively charged iron sulfur clusters. In a row. Like literally i

It's npn, as I said, because there was a positively charged iron sulfur cluster between two negatively charged iron sulfur clusters. In a row. Like literally it could not be a pnp element. And not all switches are computers. You wouldn't call your wall lightswitch a computer, because in the general case, the current running through it is not meaningfully carrying data. I don't really recommend 'learning' molecular biology. There really is no substitute for designing a molecular biology experiment, starting with dna synthesis, through cloning, and seeing it through to its biochemical outcome. It's not terribly time consuming, I had an intern that I took through the steps in 3 months, starting from no lab experience he completed 50 mutations on the enzyme, tested half of them, and got a paper out of it.