I've Got My Ion You (Cell membrane)
You must be the one since my selectively permeable membrane let you through (CELL MEMBRANE)
I surround the cell and help protect the interior by allowing only certain substances through me and keeping many substances out.
Chemistry Puns? I'm in my element
I keep the shape of the cell and hold the shape of it by enclosing the cytoplasm and organelles within, keeping a state of balance between internal and external elements. Without me the organelles would have to be exposed to the outside environment of life . . . ew. Trust me you need me, without me all the organelles would be in deep turmoil.