Nanometer and Micrometer Question Please explain how you got

Nanometer and Micrometer Question.. Please explain how you got the answer

9. If a renal proximal tubule cell (20 um x 10 um x 10 um) were the size of an SUV (length~4 meters; height~2 meters; width~2 meters), the relative size of a bacterium (2 um x 1 um x 1 um) would be closest to __________________________.

            a. a sugar cube

            b. an ice cube

            c. a shoe box

            d. a milk crate

            e. a washing machine

Solution

Answer:      c. a shoe box

20uM of proximal tubule cell ------> 4 meters(M)

Fold change = 4 meters/20uM

=4 M/ 20 x 10^-6 M

= 0.2 x 10^6

=2 x 10^5 fold

2 um of bacterium -------??

2 uM x 2 x 10^5 fold = 2 x10^-6 M x 2 x 10^5 = 0.4 M

0.4 M = 40 centimeters