Nucleus
The nucleus controls all of the cellular activities. This is accomplished via DNA molecules stored in the nucleus in elements called chromosomes. The DNA contains the coding for all protein production for the cell. The nucleus is roughly spherical and about 2 micrometers in diameter.
Mitochondria
The mitochondria is the cell's powerhouse. When oxygen is sufficient and fermentable sugars are available, the mitochondria are used to completely breakdown the sugar source and form the maximum amount of ATP.
Golgi Complex
The golgi complex is responsible for packaging materials -->readying it for transport in the cell or storage.
Endoplasmic Reticulum
This cell organelle is the cell's "highway" system. Materials are transported throughout the yeast cell through this intercellular system.