A yeast cell capable of expressing the following nucleotide sequences, wherein the expression of these nucleotide sequences confers on the yeast cell the ability to use L-arabinose and/or to convert L-arabinose into L-ribulose and/or xylulose 5-phosphate and/or into ethanol, in which yeast cell are expressed: (a) a nucleotide sequence encoding an arabinose isomerase (araA), wherein said nucleotide sequence is selected from the group consisting of: i. nucleotide sequences encoding an araA, said araA comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:1. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:2; iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); (b) a nucleotide sequence encoding a L-ribulokinase (araB), wherein said nucleotide sequence is selected from the group consisting of: i. nucleotide sequences encoding an araB, said araB comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:3. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:4. iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); and (c) a nucleotide sequence encoding an L-ribulose-5-P-4-epimerase (araD), wherein said nucleotide sequence is selected from the group consisting of: i. nucleotide sequences encoding an araD, said araD comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:5. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:6; iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii), wherein in the items iii. hybridisation is determined under hybridization conditions that allow a nucleic acid sequence of 200 nucleotides to hybridise at a temperature of 65 °C in a solution comprising about 1M salt, and washing at 65 °C in a solution of about 0.1 M, where the hybridisation is performed for 10 hours and washing is performed one hour with two changes of the washing solution. (a) a nucleotide sequence encoding an arabinose isomerase (araA), wherein said nucleotide sequence is selected from the group consisting of: i. nucleotide sequences encoding an araA, said araA comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:1. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:2; iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); i. nucleotide sequences encoding an araA, said araA comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:1. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:2; iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); (b) a nucleotide sequence encoding a L-ribulokinase (araB), wherein said nucleotide sequence is selected from the group consisting of: i. nucleotide sequences encoding an araB, said araB comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:3. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:4. iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); and i. nucleotide sequences encoding an araB, said araB comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:3. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:4. iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii); and (c) a nucleotide sequence encoding an L-ribulose-5-P-4-epimerase (araD), wherein said nucleotide sequence is selected from the group consisting of: i. nucleotide sequences encoding an araD, said araD comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:5. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:6; iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii), i. nucleotide sequences encoding an araD, said araD comprising an amino acid sequence that has at least 80% sequence identity with the amino acid sequence of SEQ ID NO:5. ii. nucleotide sequences comprising a nucleotide sequence that has at least 80% sequence identity with the nucleotide sequence of SEQ ID NO:6; iii. nucleotide sequences the complementary strand of which hybridizes to a nucleic acid molecule of sequence of (i) or (ii),