Question

I need help with these questions for microbiology class.

inoculated a culture tube with 2 cells of E.coli. IfE. coli has a generation time of 60 minutes under the conditions at which the culture is stored, how many cells would be in the culture tube when she comes back 6 hours later? Hint: You do not need a calculator for this. If you are thinking you de. you are doing it incorrectlv. It is simple arithmetic 1 What kind of epidemic is shown Curve A by curve A? What kind of epidemic is shown by curve B? t Curve B Are there diseases that don't fit neatly into either curve? Name at least 3 diseases that we have studied that fit each category Time Onset of epidemics

Answer 1

* First find out the number of generations,

Let it be n (no. of generations) = Total time for division ÷ Time for one division

Here it is given that the E.coli has a generation time of 60 minutes (ie, the time for one division= 60 min= 1hr) and the total time for division is 6hours.

Therefore, n = 6/1 = 6

You can answer any question like this using the given formula,

f = i x 2^n

Where f = final number of bacteria

i = initial number of bacteria = 2

n = number of generations = 6

So, f = 2 x 2^6

= 2 x 64

f = 128

ie, There will be 128 E.coli cells in the culture tube when she comes back 6 hrs later.