I gained a bit of respect for you now. Do you know why. The simple words I don't know.
There are things we all don't know. Don't be so hard and think you are superior to others if they don't know even if they have different ideas than you.
Cell wall is one. And you described it correctly.
The two main others would be mitochondria and the main one would be the ribosomes. (Ribosomal and the presence of mitochondrian in eukaryotes are related -- extra credit for whomever can say why).
There are others -- prokaryotes do not have introns.
Take care, vade.
If you were paying attention, Aquinasfan got an "I don't know" out of me on the woodpecker tongue. I give them out where they are merited.
The problem, as I explained to him, is you don't get much for things I don't know. Not if you're selling me that practically everything I do know is wrong. Especially if it's wrong because it's all really magic and not only I missed it but almost everybody did.
There are exceptions, of course. Some prokaryotes do have introns.