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When we eat nitrates, they are converted into nitrites in our digestive system, which are then converted to ammonia and disposed of by the body. Nitrites are also inorganic compounds made up of nitrogen and oxygen, but instead of three oxygen molecules they have two, NO2. Nitrates are not generally harmful unless they are consumed in massive quantities. Nitrites, on their own and in moderation, are also generally not harmful.
The purines are made up of two-carbon nitrogen ring bases with four nitrogen atoms while the pyrimidines are made up of one-carbon nitrogen ring bases with two nitrogen atoms. These two compounds serve as building blocks for a wide variety of organic compounds that can be found in nature and in our bodies.n microbiology, there are two types of nitrogenous bases that make up the two different kinds of nucleotide bases in DNA and RNA. These two types are called purines and pyrimidines.