Take some baker’s yeast and grape sugar and dissolve it in a little water, use a cell culture dish and a Motic inverted microscope. With Motic Images Plus 3.0 ML tuned for time laps, shooting frequency one image per minute, you will get the best results.
Yeast cells use sugars to grow. With sufficient oxygen supply - like in this case - the yeasts completely burn their nutrients into water and carbon dioxide, like all aerobic organisms e.g.:
C6H12O6 + 6H2O + 6O2 ==> 6CO2ꝉ + 12H2O