Cell size comparisons and Conversions 1) A typical human red blood cell has a diameter of about 7 micrometers (µm), while a bacterial cell such as E. coli is about 2,000 nanometers (nm) long. Which cell is larger, and by how much? 2) A plant cell is approximately 100 micrometers (µm) in diameter, and a yeast cell is about 0.01 millimeters (mm) wide. Which cell is larger? Show your calculations. 3) An amoeba can be up to 0.5 millimeters (mm) long, while a paramecium averages 250 micrometers (µm) in length. Which organism is bigger and by how many micrometers? 4) A virus measures about 100 nanometers (nm) across, while a human skin cell is around 30 micrometers (µm) in diameter. How many times larger is the skin cell compared to the virus?
