Penicillin G is a natural antibiotic that is useful for treating infections caused by Gram positive bacteria. What is the functional benefit of the semi-synthetic antimicrobials carbenicillin and ampicillin, generated by chemical modification of the R group so their R groups each are a bit different than the R group seen with penicillin G?

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Nitrogen metabolism

Nitrogen metabolism is the synthesis, utilization or uptake, breakdown, and excretion of nitrogenous compounds in the body. The nitrogen metabolism encompasses nitrogen fixation, biosynthesis, and the breakdown of amino acids, purines, and pyrimidine. Since nitrogen-containing compounds are required for various life processes, nitrogen is an important element of life.