Yeast cells take up glucose (a sugar) to use as their primary source of energy. Typically, glucose concentrations outside yeast cells are far lower than glucose concentrations inside the cells. Therefore, for yeast to take up glucose, they must:

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Since the glucose concentration outside yeast cells is lower than inside, yeast must use active transport to move glucose against its concentration gradient, from a region of lower concentration to a region of higher concentration. This process requires energy.

Yeast Cells Take Up Glucose (A Sugar) to Use as Their