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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?

H2S
H2
H2O
S (elemental sulphur)

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

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Microbial Metabolism
In order to get inorganic phosphorous into organic compounds, the phosphate ion is incorporated via

oxidative phosphorylation
both (a) and (b)
substrate level phosphorylation
DNA

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Microbial Metabolism
The glyoxylate cycle is used by some microorganisms when___________ is the sole carbon source.

acetate
nitrate
all of these
carbon dioxide

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Microbial Metabolism
Which of the following nucleoside diphosphates is used most often in carbohydrate anabolism?

Thymine diphosphate
Adenosine diphosphate
Guanine diphosphate
Uridine diphosphate

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Microbial Metabolism
The major route for incorporation of ammonia (NH4+) into organic compounds is via

reduction of pyruvate or alpha-ketoglutarate by enzymes
atmospheric nitrogen fixation
all of these
oxidation of pyruvate

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