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biostat chi square test chi test biostatistics bacteria bacteria structure bacterial endospore gram negative bacteria gram positive bacteria bacterial cell wall amino acid synthesis nitrogenous bases nucleic acids pyrimidines purines biosythesis of purines biosynthesis of purines uses of biosensors types of biosensor application of biosensor biosensor dna damage conjugation diesease associated with dna repair system transduction dna repair bacterial recombination recombinant insulin insulin production humulin insulin vaccine preservation vaccines production history of vaccines types of vaccines vaccines production of vitamin a role of vitamin a disease related to vitamin a recombinant vitamin a vitamin a drugs pollution ethical issue related to drugs recombinant drugs drugs