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

enzymes
RNA
all of these
DNA

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Microbial Metabolism
Dolichol phosphate is

the anchor on which sugars assemble before transfer to proteins
a chaperone used in protein folding
a product of phospholipase C activation
a complex lipid involved in docking vesicles with the plasma membrane

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