|Protists such as paramecium engulf
solid food (such as yeast cells), forming food vacuoles, within which the
food is digested. This process can be followed using a simple light microscope,
allowing us to see both where in the Paramecium the vacoule is at any given
time, as well as its size. In addition, staining the Parameciums food (yeast
cells) with a pH-sensitive dye (Congo red) allows us to monitor the pH
inside the food vacuole. The figure to the right illustrates this
What can be deduced from this illustration?