A)O₂ is released.
B)Hydrogen sulfide or thiosulfate can act as electron donors.
C)Bacteriochlorophyll b absorbs light energy in the far red range of the light spectrum.
D)Electron flow is coupled to unidirectional proton pumping across the bacterial plasma membrane.
E)Following electron flow,the electron is transferred from cytochrome c to bacteriochlorophyll b .

A)anabolic; catabolic
B)catabolic; anabolic
C)metabolic; anabolic
D)anabolic; both catabolic and anabolic
E)both catabolic and anabolic; catabolic

A)light absorption by chlorophyll.
B)electron flow through an electron transport system.
C)unidirectional proton pumping across a membrane.
D)an electrochemical proton gradient.
E)All are involved in the energy transduction.