Suspension cells and cotyledons of Ricinus communis were compared as to their uptake
properties for sugar and amino acids to reveal whether the previously reported sucrose-
specificity of the cotyledon is a specific feature of the cotyledon or of the Ricinus cell in
general. The experiments show that suspension cells have a higher hexose uptake activity
at low sugar concentration than cotyledons, whereas sucrose cannot be taken up by
suspension cells unless it is first hydrolyzed. Amino acids are taken up by suspension cells …