NOVELTY - A recombinant yeast host cell (C1) containing at least two heterologous polynucleotides encoding a polypeptide comprising: at least one amino acid sequence that is at least 90% identical to at least one of specific amino acid sequence, is new.    USE - For fermenting lignocellulosic biomass selected from insoluble cellulose, crystalline cellulose, pretreated hardwood, paper sludge, corn fiber, and agave, where the fermentation product is selected from ethanol, lactic acid, hydrogen, butyric acid, acetone, and butanol; for fermenting biomass feedstock comprising grain feedstock, corn starch and fiber, and pentose sugar (such as xylose or arabinose); and for converting acetate to ethanol (claimed).    ADVANTAGE - The host cell is an industrial strain exhibiting high ethanol tolerance; exhibits high temperature tolerance (i.e. the host cell grows at a temperature of at least 41 degrees C); produces an ethanol yield of at least 125 (preferably at least 140) g/l ethanol at 72 hours from corn mash. The media supernatant generated by the host cell is harvested and purified. The host cell expresses enzymes that have synergistic activity with respect to their action on given substrate. In the cells, the endogenous glycerol-producing or regulating genes are deleted or down-regulated such that glycerol production is down regulated in comparison with a wild type yeast cell.    DETAILED DESCRIPTION - A recombinant yeast host cell (C1) containing at least two heterologous polynucleotides encoding a polypeptide comprising: at least one amino acid sequence that is at least 90% identical to at least one of the amino acid sequences of (SEQ ID NO: 219) to (SEQ ID NO: 436) (as available on WIPO website), and to at least one of the amino acid sequences of (SEQ ID NO: 442) to (SEQ ID NO: 446), as available on WIPO website, is new. INDEPENDENT CLAIMS are included for the following: 1) new recombinant yeast host cell (C2) comprising at least one heterologous polynucleotide encoding a polypeptide as given in Table 11 of the specification; and/or at least one heterologous polynucleotide encoding a polypeptide as given in Table 19 of the specification; 2) new recombinant yeast host cell (C3) comprising at least one heterologous polynucleotide containing nucleic acid which encodes an endoglucanase; at least one heterologous polynucleotide comprising a nucleic acid which encodes beta -glucosidase; at least one heterologous polynucleotide containing nucleic acid which encodes a first cellobiohydrolase; at least one heterologous polynucleotides comprising a nucleic acid which encodes a second cellobiohydrolase; and at least one heterologous polynucleotide encoding a polypeptide containing amino acid sequence according to (SEQ ID NO: 219) to (SEQ ID NO: 436); 3) new transformed yeast host cell (C4) comprising at least one heterologous polynucleotide containing nucleic acid which encodes an endoglucanase; at least one heterologous polynucleotide containing nucleic acid which encodes beta -glucosidase; at least one heterologous polynucleotide containing nucleic acid which encodes a first cellobiohydrolase; at least one heterologous polynucleotide containing nucleic acid which encodes a second cellobiohydrolase; and at least two heterologous nucleic acid pairs selected from 19 pairs as given in the specification, e.g. cellulase pairs consisting of (Streptomyces avermitilis endo-1,4-beta-glucanase celA2 (Accession No. NP823030.1) and (Streptomyces avermitilis endo-1,4-beta-glucanase celA5 (Accession No. NP828072.1)); and (Streptomyces avermitilis endo-1,4-beta-glucanase celA2 (Accession No. NP823030.1) and Bacillus subtilis endo-1,4-beta-glucanase (Accession No CAB 13696.2)); 4) a composition comprising a lignocellulosic substrate and the host cell; 5) generating a media supernatant involving incubating the host cell with a medium containing a carbon source; 6) producing a fermentation product involving combining the host cell (C1)-(C4) with a lignocellulosic material; allowing the host cell to ferment the lignocellulosic material; and recovering at least one product of the fermentation; 7) a co-culture of the host cells (C1)-(C4); 8) new recombinant yeast host cell (C5) comprising: at least one heterologous polynucleotide containing nucleic acid which encodes a glucoamylase; at least one heterologous polynucleotide containing nucleic acid which encodes an alpha-glucosidase; at least one heterologous polynucleotide comprising a nucleic acid which encodes an enzyme that hydrolyzes pentose sugar; and at least one heterologous polynucleotide encoding a polypeptide comprising an amino acid sequence according to (SEQ ID NO: 442) to (SEQ ID NO: 446); 9) new transformed yeast cell (C6) comprising: at least one heterologous polynucleotide containing nucleic acid which encodes a glucoamylase; at least one heterologous polynucleotide containing nucleic acid which encodes an alpha-glucosidase; at least one heterologous polynucleotide containing nucleic acid which encodes an enzyme that hydrolyzes pentose sugar; and at least two heterologous nucleic acid pairs selected from 27 pairs, as given in the specification, e.g. (SEQ ID NO: 443 and SEQ ID NO: 444); (SEQ ID NO: 443 and SEQ ID NO: 445); (SEQ ID NO: 445 and SEQ ID NO: 446); and (SEQ ID NO: 442 and SEQ ID NO: 445); 10) a composition comprising a grain feedstock-based substrate and the yeast cell (C1), (C2), (C5) or (C6); 11) media supernatant comprising the yeast cell (C1), (C2), (C5) or (C6) and a medium containing a carbon source; 12) producing a fermentation product involving: combining the yeast cell (C1), (C2), (C5) or (C6) with grain feedstock; allowing the yeast cell to ferment the grain feedstock; and recovering at least one product of the fermentation; 12) a fermentation product produced by the yeast cell (C1), (C2), (C5) or (C6); 13) a co-culture of the yeast cells (C1), (C2), (C5) or (C6); 14) new host cell (C7) comprising a polynucleotide encoding polypeptides comprising the amino acid sequences of (SEQ ID NO: 447) to (SEQ ID NO: 449); and 15) a fermentation product produced by the host cell.