Microbial Metabolism
Which of the following groups contain(s) many unique coenzymes, such as coenzyme M and coenzyme F420?

Methanogens (methane-producing microbes)
Methanotrophs (methane-oxidizing microbes)
Sulfate-reducing bacteria
Acetogens (acetigens; acetate-producing microbes)

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Microbial Metabolism
The mechanism of passive or facilitated diffusion require

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

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