Sucrose was found to be directly transported into Saccharomyces cerevisiae without first being hydrolysed to its constituent monosaccharides. The yeast cells were adapted on sucrose media for either 2 or 14 d before uptake assays were carried out. The initial uptake rates of sucrose were higher in fully adapted cells (14 d) than in unadapted cells (2 d) for all concentrations of sucrose used in the study. This means that the sucrose transport system is induced if enough time is allowed for adaptation on sucrose.