NOVELTY - Method of metabolizing a biomolecule, comprises: incubating or contacting the biomolecule with a recombinant microorganism, to allow metabolism of at least part of the biomolecule, where the recombinant microorganism comprises a polynucleotide, thus metabolizing the biomolecule.    USE - The method is useful: for metabolizing a biomolecule, which is a polysaccharide (preferably alginate, pectin, cellulose, cellobiose and/or laminarin) and a lipid (preferably fatty acid, glycolipid, betaine lipid, glycerolipid, phospholipid, glycerophospholipid, sphingolipid, sterol lipid, prenol lipid, saccharolipid and/or polyketide); for enhancing production or yield of a target molecule, which is a commodity chemical, preferably ethanol, butanol and biodiesel (which is a fatty acid, fatty acid ester and terpenoid); and for converting a saccharide and/or a fatty acid (preferably tetradecanoic acid (14:0), trans-14, hexadecanoic acid (16:0), hexadecenoic acid (16:1n-7), A3-trans-hexadecenoate (trans-16), hexadecadienoic acid (16:2n-6), octadecanoic acid (18:0), octadecenoic acid (18:1n-9), octadecadienoic acid (18:2n-6), gamma-linolenic acid (18:3n-6), alpha-linolenic acid (18:3n-3), octadecatetraenoic acid (18:4n-3), eicosanoic acid (20:0), eicosadienoic acid (20:2n-6), dihomo-gamma-linolenic acid (20:3n-6), eicosatetraenoic acid (20:4n-3), arachidonic acid (20:4n-6) or eicosapentaenoic acid (20:5n-3)), to ethanol (all claimed), where the commodity chemical is minerals, polymer precursors, fatty alcohols, surfactants, plasticizers and solvents, preferably e.g. methane, methanol, ethane, ethene, n-propane, 1-propene, 1-propanol, propanal, acetone, propionate, n-butane, 1-butene, 1-butanol, butanal, butanoate, isobutanal, isobutanol, 2-methylbutanal, 2-methylbutanol, 3-methylbutanal, 3-methylbutanol, 2-butene, 2-butanol, 2-butanone, 2,3-butanediol, 3-hydroxy-2-butanone, 2,3-butanedione, ethenylphenol, 2-(4-hydroxyphenyl) ethanol, 4-hydroxyphenylacetaldehyde, 1-(4-hydroxyphenyl)butane, 4-(4-hydroxyphenyl)-1-butene, 4-(4-hydroxyphenyl)-2-butene, 1-(4-hydroxyphenyl)-1-butene, 1-(4-hydroxyphenyl)-2-butanol, 4-(4-hydroxyphenyl)-2-butanol, 1-(4-hydroxyphenyl)-2-butanone, 4-(4-hydroxyphenyl)-2-butanone, 1-(4-hydroxyphenyl)-2,3-butandiol, 1-(4-hydroxyphenyl)-3-hydroxy-2-butanone, 4-methyl-1-phenyl-2,3-pentanedione, 4-methyl-1-phenyl-3-hydroxy-2-pentanone, 4-methyl-1-phenyl-2-hydroxy-3-pentanone, 1-(4-hydroxyphenyl)pentane, 1-(4-hydroxyphenyl)-1-pentene, 1-(4-hydroxyphenyl)-2-pentene, 1-(4-hydroxyphenyl)-3-pentene, 1-(4-hydroxyphenyl)-2-pentanol, 1-(4-hydroxyphenyl)-3-pentanol, 4-methyl-1-(4-hydroxyphenyl)pentane and 4-methyl-1-(4-hydroxyphenyl)-2-pentene.    ADVANTAGE - The method: enhances yield of the target molecule to at least 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 88%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% of a theoretical maximum yield; increases percentage yield of the target molecule by at least 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80% or 90% as compared to incubating the microorganism with the uronic acid alone or the sugar alcohol alone; reduces intracellular NADH/NADPH accumulation as compared to incubating the microorganism with the sugar alcohol alone; reduces intracellular acetate accumulation as compared to incubating the microorganism with the uronic acid alone; optimizes the production of biofuels or other commodity chemicals from biomass, hence provides an efficient and relatively low impact alternative for producing useful and valuable chemicals from natural and renewable resources; directs the metabolizing or transporting enzymes to the media or outer cell surface, and allows them to start the metabolic process outside of the cell, hence makes it easier for microorganisms to transport the resulting metabolites into the cell, and to rely on those metabolites in their intracellular metabolic processes (e.g. glycolysis and fatty acid metabolism).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) an isolated polynucleotide, comprising: a nucleotide sequence that encodes a fusion polypeptide, where the fusion polypeptide comprises a carrier polypeptide, or its active fragment, and a passenger polypeptide comprising a lyase, cellulase, laminarinase, lipase, or their active fragments or variants, fused to it; #(2) a vector, comprising a polynucleotide; #(3) a recombinant microorganism, comprising a polynucleotide, or a vector; #(4) a recombinant microorganism that is capable of growing on a polysaccharide as a sole source of carbon, comprising exogenous polynucleotides containing a genomic region between V12B0124189 and V12B0124249 of Vibrio splendidus, and that encodes an additional outer membrane porin; #(5) a method of enhancing production or yield of a target molecule by a recombinant microorganism, comprising: incubating the microorganism with a mixture of at least one uronic acid and at least one sugar alcohol under anaerobic fermentative conditions, to allow metabolism of at least part of the mixture, where the uronic acid and the sugar alcohol have different reduction-oxidation (redox) potentials, and metabolism of the mixture balances the intracellular redox potential of the microorganism, thus enhancing production or yield of the target molecule; and #(6) a method of converting a saccharide and/or a fatty acid, to ethanol, comprising incubating the saccharide and/or fatty acid, with a recombinant microorganism.