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
RNA
all of these
enzymes

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Microbial Metabolism
The mechanism of passive or facilitated diffusion require

concentration of solute against an electrochemical gradient
accumulation of solute against an electrochemical gradient
accumulation or concentration of solute against an electrochemical gradient
metabolic energy

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