Abstract
1. 1. The luminal side of the Ascaris intestinal cells has maltase, but no lactase activity. 2. 2. When intestinal sacs containing maltose are incubated, high concentrations of glucose appear in the lumen. The mechanism of glucose transport saturates before the process of maltose hydrolysis. 3. 3. When intestinal sacs are incubated with sucrose, fructose appears in the lumen at higher concentrations than glucose. With sucrose and phloridzin, the concentration of luminal glucose equals the concentration of fructose. 4. 4. These experiments suggest that the hydrolysis of disaccharides and the transport of monosaccharides are independent processes and that only the latter can enter the cell.
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