NOVELTY - A herbicide resistant alga comprising a recombinant polynucleotide (p1) integrated into the alga genome, where the recombinant polynucleotide (p1) comprises a sequence encoding at least one protein that confer herbicide resistance to the alga is new.    USE - For transformation of an alga (claimed); for the production of and isolation of various products e.g. biomolecules used as industrial enzymes, therapeutic compounds and proteins, nutritional products, commercial products or fuel products.    ADVANTAGE - The herbicide resistant algae are able to grow in the presence of the herbicide at a concentration that deters growth of algae not harboring the herbicide resistance gene. The presence of the herbicide may also deter the growth of other organisms, such as algal species. The herbicide resistant algae allow the growth of the algal host species in a concentration of herbicide that prevents the growth of untransformed algae of the same species.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an isolated polynucleotide (p2) for transformation of an alga comprises at least one nucleic acid sequence encoding a protein that confers herbicide resistance to the alga. The nucleic acid sequence comprises: 43 nucleotide sequences (n1) as given in the specification e.g. (SEQ ID NO: 5), (SEQ ID NO: 8), (SEQ ID NO: 10), (SEQ ID NO: 12), (SEQ ID NO: 14), (SEQ ID NO: 16), (SEQ ID NO: 18), (SEQ ID NO: 20), (SEQ ID NO: 22), or (SEQ ID NO: 24) (SEQ ID NOs.: not defined); a nucleotide sequence homologous to the nucleotide sequences (n1); or the nucleotide sequences (n1) comprising at least one mutation. The protein comprises: 56 amino acid sequences (a1) as given in the specification e.g. (SEQ ID NO: 1), (SEQ ID NO: 2), (SEQ ID NO: 3), (SEQ ID NO: 4), (SEQ ID NO: 6), (SEQ ID NO: 7), (SEQ ID NO: 9), (SEQ ID NO: 11), (SEQ ID NO: 13) or (SEQ ID NO: 15) (SEQ ID NOs.: not defined); an amino acid sequence homologous to the amino acid sequences (a1); or the amino acid sequence of the amino acid sequence (a1) comprising at least one mutation;    (2) production (M1) of biomolecule involving: transforming an alga with a polynucleotide comprising a sequence conferring herbicide resistant to the alga; growing the alga in the presence of the herbicide; and harvesting at least one biomolecule from the alga;    (3) a business method (M2) involving: growing recombinant alga resistant to a herbicide in the presence of the herbicide and selling carbon credits resulting from carbon used by the alga;    (4) production (M3) of a biomass-degrading enzyme in an alga involving: transforming the alga with a polynucleotide comprising a sequence conferring herbicide tolerance to the alga and a sequence encoding an exogenous biomass-degrading enzyme or which promotes increased expression of an endogenous biomass-degrading enzyme; growing the alga in the presence of the herbicide, where the herbicide is in sufficient concentration to inhibit growth of the alga which does not comprise the sequence conferring herbicide tolerance, arid under conditions which allow for production of the biomass-degrading enzyme, thus producing the biomass-degrading enzyme; and    (5) an isolated polynucleotide (p3) for transformation of a non-chlorophyll c-containing alga to herbicide resistance, where the polynucleotide comprises a sequence encoding a heterologous protein that confers resistance to a herbicide, where the protein encoding sequence is codon biased to reflect the codon bias of the nuclear genome of the alga.