Experiment_Yeast

__Yeast experiment__
When yeast was added to glucose, a gas was produced (carbon dioxide). The glucose was heated, increasing the rate of respiration and causes carbon dioxide to be produced rapidly. Therefore, foaming occurred.

__**Reactions:**__ Blue methylene blue is reduced to a colourless methylene blue (gains electrons). It can be oxidized back to blue (loses electrons).
 * Live yeast:** When blue methylene blue is added to the live yeast, the methylene blue will be de-colourized. It shows that the methylene blue is reduced, gaining electrons.
 * Dead yeast:** There is no oxidation or reduction when the blue methylene blue is added to the dead yeast. The suspension remains blue.

All yeast cells allow methylene blue to diffuse through its membrane. Live yeast cells will cause the methylene blue to de-colourize (appearing colourless under the microscope), whilst no reaction takes place within the dead yeast cells (appearing blue under microscope).

Don't be so long winded!