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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
H2O
S (elemental sulphur)
H2

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Microbial Metabolism
Radioisotopes are frequently used in the study of cells. Assume a culture of E. coli is grown in a culture medium containing radioactive sulphur. At the end of 48 hours, it is expected to find the radioactive label located in

DNA
enzymes
all of these
RNA

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Microbial Metabolism
Most of the energy in aerobic respiration of glucose is captured by

the enzyme formic-hydrogen lyase
electron transport of electrons from NADH
long-chain fatty acid oxidation
substrate-level phosphorylation

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Microbial Metabolism
Entner-Doudoroff pathway is found in

both (a) and (b)
aerobic eukaryotes
anaerobic prokaryotes
aerobic prokaryotes

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Microbial Metabolism
Hexose monophosphate pathway is also known as

oxaloacetate pathway
phosphogluconate pathway
malate pathway
fumerate pathway

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Microbial Metabolism
If ΔG of a chemical reaction is positive in value and keq is less than 1 then the chemical reaction will

proceeed in forward direction
none of these
proceed in reverse direction
not take place in any of the direction

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