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

all of these
RNA
enzymes
DNA

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Microbial Metabolism
ATPase

carries out each of the reactions indicated in (a) and (b)
extrudes protons from the cell coupled to the hydrolysis of ATP to ADP
is the enzyme that incorporates ATP into messenger RNA
synthesizes ATP, coupled to transfer of extracellular protons into the cell

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