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Microbial Metabolism

Microbial Metabolism
In an oxygenic photosynthesis, the green and the purple bacteria do not use which of the following one as an electron source?

H2
H2O
S (elemental sulphur)
H2S

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Microbial Metabolism
The bacteriochlorophylls used by the anoxygenic bacteria have absorbance maxima located in the_____portion(s) of the spectrum.

ultraviolet
infrared
green
blue

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Microbial Metabolism
If radioactive bicarbonate was supplied to bacterial cells, which were actively synthesizing fatty acids, it is expected to find the bulk of the radioactivity in

the fatty acids
the cytoplasmic membrane
nucleic acids
cellular bicarbonate

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Microbial Metabolism
Nitrogen fixation is a process that requires

energy
an aerobic environment
both (a) and (b)
an anaerobic environment

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Microbial Metabolism
The relationship between an oxidation-reduction potential difference and the standard free energy change is (where n is the number of moles of electron transferred, F= Faraday's constant and E°= standard oxidation-reduction potential difference)

ΔG° = nFE°
ΔG° = -nFlnE°
ΔG° = -nFE°
ΔG° = nFlnE°

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Microbial Metabolism
If ΔG of a chemical reaction has a negative value, the reaction

releases energy
none of these
requires energy
both (a) and (b)

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