Nitrogenous bases are located on both stands of the DNA double helix. What is the significance of the nitrogenous bases?

the nitrogenous bases form hydrogen bonds between opposing DNA strands to form the rungs of the Twisted ladder or double helix of DNA or biological catalysts that is found in the nucleotides.

Explanation:

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the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

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.