Question

5.7. compare and contrast photosynthesis and cellular respiration. 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) an abundant electron donor such as glucose aerobic conditions (the presence of oxygen) an abundance of light anaerobic conditions (the absence of oxygen)

Explanation:

For a "rock - breather" to expel electrons onto an anode, it needs a source of electrons. Glucose is a common electron - donor in biological systems. While oxygen can be an electron - acceptor in aerobic conditions, its presence or absence is not the most fundamental requirement for electron donation to the anode. Light is not relevant as the process described is related to cellular respiration - like pathways, not photosynthesis. Anaerobic conditions are not necessary as the "rock - breather" can operate in both aerobic and anaerobic situations.

Answer:

an abundant electron donor such as glucose