To complete the argument for prior fitness of the elements for our Privileged Species, we must deal with the availability of another essential element.
As usual, evolution-talk is inversely proportional to the amount of detail presented about cellular workings.
Universal functional requirements, but without the identity of material components — sounds like design.
Cell membranes are essential for life because they actively maintain homeostasis, providing a consistent environment inside the cell.
Replication or transcription of DNA stresses the macromolecule, resulting in supercoiling. Topoisomerase II relieves the stress.