Choose a coccus and a bacillus from the organisms you observed and calculate their surface-to-volume ratios. Consider the coccus to be a perfect sphere and the bacillus to be a cylinder. Use the equations supplied. Please show details....Thank you!

Cell Morpholgy Surface Area Volume

Coccus (S.aureus, d=1 um) SA = 4π2 V = 4/3 π3

Bacillus (E. Coli, d=1 um, h=2 um) SA = 2π r h + 2 π r2 = π d (r + h) V = π2 h

Surface- to-Volume Ratio of Sample Cells

Organism Cell Morphology Surface Area (um 2) Volume (um 3) Surface-toVolume-Ratio

S. aureus

E. Coli