| 1 | Discovering a yeast infection. | |
| 2 | Hybridization is also used for the improvement of yeast strains. | |
| 3 | Otherwise, high concentrations of isobutanol would inhibit the growth of the yeast. | |
| 4 | He and his colleagues found the genes in yeast. | |
| 5 | Experiments show yeast and worms deprived of oxygen can survive extreme cold. |