Under standard growth conditions, the bacterial strain, E.coli, has a doubling time of 20 minutes.   If 1 single bacterial cell is used to start a culture grown under standard growth conditions, how many bacterial cells will there be after the culture is grown for 4 hours?
4 hours is 4*60=
<gadget id="calculator">4*60</gadget>
<output>240</output>
240 minutes.
If the doubling time is 20 minutes, then after 240 minutes, the number of bacteria would have doubled 240/20=
<gadget id="calculator">240/20</gadget>
<output>12</output>
12 times.
Thus, starting with only 1 bacterial cell, after 4 hours, there will be 1*2*2*2*2*2*2*2*2*2*2*2*2= 4,096 bacterial cells.

<result>4_096</result>