What determines which electron donor and electron acceptor a given microbe uses in its anaerobic ETS? Choose one: A. Microbes use the most common donor available for their donor; the only acceptor that works with the ETS is oxygen. B. The available donors and acceptors will induce gene expression of their redox enzymes, thereby allowing their use. C. Each bacterium can only use one donor and one acceptor in their ETS. D. Microbes use the most common donors and acceptors available.

B. The available donors and acceptors will induce gene expression of their redox enzymes, thereby allowing their use

Explanation:

Electron transport chain is the important stage of cellular respiration where the electron is donated by certain redox molecules.

The ETC takes place in both the aerobic and anaerobic type of respiration wherein the aerobic respiration, oxygen is used as the electron acceptor whereas in the anaerobic respiration some other molecules like sulfate and nitrate are used.

In anaerobic respiration, the type of electron donors and the donor-acceptor molecules determine the fate of the chain as these molecules act as an inducer of the genes of redox enzymes and the genes for the enzymes are expressed.

Thus, Option-B is correct.