Question

a “rock breather,” which donates electrons to the anode end of an electrode, usually carries out the typical respiratory pathways of glycolysis, the krebs cycle, and some form of an electron transport chain that donates electrons to one of several possible electron acceptors. one such acceptor is oxygen, via oxidative phosphorylation, if oxygen is present. oxygen is the most energetically favorable electron acceptor for the cell, as it produces the most atp. however, a rock - breathing microbe can also donate electrons to an oxidized form of iron or sulfur when oxygen is absent, or to an anode that will then shuttle the electrons ultimately to the preferred electron acceptor, oxygen. such a “rock breather” will likely require which of the following in order to expel electrons onto an anode? correct answer(s) anaerobic conditions (the absence of oxygen) an abundance of light an abundant electron donor such as glucose aerobic conditions (the presence of oxygen) incorrect answer(s)

Explanation:

Electron - donating to anode by rock - breathers can occur when oxygen is absent (anaerobic conditions) as they can use other electron acceptors like iron or sulfur. Also, an electron donor like glucose is needed to provide electrons for the process. Light is not related to this electron - donation process to the anode. Aerobic conditions (presence of oxygen) are not necessary as they can function without oxygen too.

Answer:

anaerobic conditions (the absence of oxygen), an abundant electron donor such as glucose