TABLE 14.1 \"Electron Tower\" of Standard Reduction Potentials. Eo (mV) -430 -42
ID: 201109 • Letter: T
Question
TABLE 14.1 "Electron Tower" of Standard Reduction Potentials. Eo (mV) -430 -420 320 -280 240 220 Electron acceptor Electron donor CO2+4H+4e 2H+ +2e NAD2H+ 2e so +H + 2e CO2+ 2H3H2 2e +166 +81 +62 +27 +46 +170 +42 +37 +14 5 19 21 -81 255 89 257 74 -158 [CH201 glucose+ H20 2 NADH +H HS CH4 + 2H20 H2S +4H20o FAD +2H+ +2e FMN2H+2e Menaquinone2H2e Fumarate+2H+2e 220b FADH FMNH Menaquinol Succinate 2 2 -190 74 +33 +200 +110 +420 +440 +460 +740 +770 +820 Fe2 (at pH 7) Ubiquinone 2H +2e NO 2H +2e Ubiquinol NO2 H2O NH4 +2H2O Mn2 +2H,0 N+3H20 MnO +4H +2e Fe2 (at pH 2) 402 + 2H+ + 2e H2O Reduction potentials for redox couples when all concentrations are 1 M at 25C and pH 7. This value is for free FAD; FAD bound to a specific flavoprotein has a different E that depends on its protein environmentExplanation / Answer
Answer : option is B
The net reaction is highly endergonic, as the standard free-energy change of the combined reaction is positive. Also, the greater the reduction potential differences between the donor and acceptor, the greater the energy available for growth. In this case the reduction potential differences between the donor and acceptor is very low, and this do not support the growth of bacteria.
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