Which of the following statements is TRUE regarding the relative sizes of the different individual cells? a) Staphylococcus aureus are larger than Saccharomyces cerevisiae. b) Bacillus subtilis are larger than Saccharomyces cerevisiae. c) Human blood cells are larger than Bacillus subtilis. d) Staphylococcus aureus are larger than human blood cells.

Eukaryotes are typically much larger than prokaryotes. Prokaryotes vary in size from cells as small as about 0.2 mm in diameter to those more than 700 mm in diameter.

Bacillus subtilis, which are rod-shaped, are 4–10 micrometers (μm) long and 0.25–1.0 μm in diameter.

Staphylococcus aureus, which are spheres, are up to 1 μm in diameter.

Yeast cells are typically much larger than bacterial cells and can be distinguished from bacteria microscopically by their larger size. A single cell of Saccharomyces cerevisiae is about 6 μm in diameter.

On the other hand, red blood cells have a diameter of 6 - 8 μm.