NOVELTY - An isolated microorganism that produces one or more fermentation end-products from a biomass, the microorganism comprising a genetic modification that enables the microorganism to synthesize more cellulases in the presence of an inhibitor molecule than a microorganism of the same species without the genetic modification, is new.    USE - The microorganism and plant are useful for producing one or more fermentation-end products, fermenting a biomass material, and hydrolyzing and fermenting a carbonaceous biomass (all claimed).    ADVANTAGE - The microorganism is capable of hydrolyzing polysaccharides as a sole carbon source. The microorganism is capable of reducing glucose into ethanol at rate of over 45 g/l. The microorganism is capable of growth under conditions of elevated ethanol concentration. The microorganism is capable of growth under conditions of high sugar concentration. The microorganism is capable of growth under conditions of low sugar concentration (all claimed).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are: (1) a method of producing one or more fermentation-end products; (2) a plant for producing one or more fermentation end products, comprising (i) a fermenter configured to house a biomass in a medium; and (ii) a first isolated microorganism, the microorganism comprising a genetic modification that enables the microorganism to synthesize more cellulases in the presence of an inhibitor molecule than a microorganism of the same species without the genetic modification; (3) a method of fermenting a biomass material, by contacting the biomass material with a culture of Q.17, Q.18, Q.19 or Q.20 biocatalyst, or with a culture deposited under NRRL Accession Numbers NRRL B-50436 or NRRL B-50437; (4) a method of hydrolyzing and fermenting a carbonaceous biomass where the biomass is contacted by a Clostridium phytofermentans Q.17, Q.18, Q.19 or Q.20 bacterium for a period long enough to produce ethanol at 70-99.99% theoretical yield from the carbonaceous biomass; (5) a fuel plant comprising a fermenter configured to house a medium and a strain of Q.17, Q.18, Q.19 or Q.20 bacteria, where the fermenter comprises a biomass; and (6) a process for introducing genetic material into host cells and selecting for cells comprising the genetic material by suspending the host cells in a buffer of: 250 mM sucrose; 5 mM sodium phosphate; and 2 mM magnesium sulfate (MgSO4); adding the genetic material; subjecting the host cells to an electrical treatment, thus permitting the transfer of the genetic material into the host cells; incubating the host cells in growth medium; adding a nonlethal concentration of a selective antibiotic; and allowing a number of generations of growth of the host cells; thus producing transformed cells comprising the genetic material.