a thick peptidoglycan layer, which must be traversed to inject the phage genome into the bacterial cytoplasm. peptidoglycan-degrading enzymes are expected to facilitate this penetration, and such enzymes have been found as structural elements of a number of lab phages. lactic acid bacteria and dental plaque lab are able to synthesize levans from sucrose, and dextrans from glucose. dextrans, like other glucan, enable bacteria to adhere to the surface of teeth, which in turn can cause tooth decay through the formation of dental plaque and production of lactic acid. while the primary bacteria responsible for tooth decay is streptococcus mutans, lab do feature among the other most common oral bacteria that cause decay. lactic acid bacteria genera abiotrophia aerococcus carnobacterium enterococcus lactobacillus lactococcus leuconostoc oenococcus pediococcus streptococcus tetragenococcus vagococcus weissella