A variety of bacteria normally inhabit the vagina. How could a practitioner differentiate between these normally present bacteria and C. albicans just by looking at a wet mount sample under the microscope without differential staining procedures?

By the size and shape of the organisms.

Explanation:

C. albicans isn't a bacteria, it's actually a fungi. Therefore, there will exist significant differences between the bacteria normally found in the vagina, and the fungi that can be causing an infection. Fungus are, usually, bigger than bacteria. Also bacteria have special shapes, like bacillus and spirils, which fungus don't.