Microbial Metabolism
The role of bacteriophyll in an oxygenic photosynthesis is to

transfer electrons to an intermediate in the sulfide oxidation pathway
reduce NADP directly
use light energy to energize an electron
reduce ferridoxin directly

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Microbial Metabolism
The mechanism of passive or facilitated diffusion require

metabolic energy
concentration of solute against an electrochemical gradient
accumulation of solute against an electrochemical gradient
accumulation or concentration of solute against an electrochemical gradient

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