Which of the following enzymes catalyzes the elongation of a new DNA strand? RNA polymerase
DNA ligase
reverse transcriptase
DNA polymerase

this protocol provides a detailed procedure for chromatin immunoprecipitation (chip) to study the dna-protein interactions.

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.