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

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

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Microbial Metabolism
The mechanism of passive or facilitated diffusion require

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

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