NOVELTY - A composition for producing a fermentation end-product, comprises (i) a carbonaceous biomass; and (ii) a genetically modified or mutagenized microorganism that hydrolyses and ferments pentose and hexose saccharides from the biomass, where a non genetically modified or non-mutagenized strain of the microorganism is genetically modified or mutagenized to produce the fermentation end-product, and where the microorganism is genetically modified or mutagenized to produce a higher concentration of the fermentation end-product compared to a non-genetically modified form of the microorganism.    USE - The composition and system are used for producing a fermentation end-product (claimed).    ADVANTAGE - The present invention provides microbial species that can produce many different chemicals, utilize different feedstocks, and through modification, ferment biomass cost-effectively for specific chemicals.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are: (1) a fermentation composition comprising (i) a carbonaceous biomass, (ii) a strain of Clostridium phytofermentans, or Clostridium sp. Q.D, and (iii) aspartic acid, aspartate, glutamic acid, glutamate, malic acid, or malate; (2) a process for producing a fermentation end-product by (a) contacting a carbonaceous biomass with microorganism that hydrolyses and ferments pentose and hexose saccharides from the biomass, where the microorganism is genetically modified or mutagenized to produce a higher concentration of the fermentation end-product compared to a non-genetically modified or non-mutagenized form of the microorganism, and where a non-genetically modified strain of the microorganism is genetically modified to produce the fermentation end-product, and (b) allowing sufficient time for the hydrolysis and fermentation to produce the fermentation end-product; (3) a fermentation end-product produced by the process of (2); and (4) a system for producing a fermentation end-product, comprising a fermentation vessel comprising (i) a carbonaceous biomass, and (ii) a microorganism that hydrolyses and ferments pentose and hexose saccharides from the biomass, where the microorganism is genetically modified or mutagenized to produce a higher concentration of the fermentation end-product compared to a non genetically modified or mutagenized form of the microorganism, where a non genetically modified or non mutagenized strain of the microorganism is genetically modified or mutagenized to produce the fermentation end-product, and where the fermentation vessel is adapted to provide suitable conditions for fermentation of pentose and hexose saccharides into the fermentation end-product.