In an experiment, viruses were marked with radioactive DNA labeled with phosphorus-32, as shown on the left, or radioactive protein, which was labeled with sulfur-35, shown on the right. After the viruses infected bacteria, radiation was found inside only the bacteria that had been infected by the virus that had radioactive DNA.

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

the contamination

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