Lipids diffuse laterally on a layer of membrane, by exchanging places with their neighbors every 100 nanoseconds (ten to the minus seven seconds). It takes about 1 second for a lipid molecule to diffuse from one ensd of a bacterium to the other, a distance of 2 micrometers. Assume the diameter of a lipid head is 0.5 nanometers. Based on the exchange rate how much time should it take for a lipid to move from one end of the bacterium to the other? Is this time in agreement time with the diffusion time? Why or why not?