This is quite similar to human breathing, where oxygen also serves as electron acceptor. (sciencedaily.com)
In such organic - rich marine sediments, sulfate then becomes the most important terminal electron acceptor due to its high concentration in seawater, although it too is depleted by a depth of centimeters to meters. (en.wikipedia.org)
In DNA's core, base pairs form a so - called BORDER = 0 > stack (gray, shown in top and side views) along which electrons may tunnel from a distant site to an artificial electron acceptor (yellow). (sciencemag.org)