human
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?
assistant
How many minutes are in 4 hours? ** 4 hours is 4*60=<<4*60=240>>240 minutes.
How many doublings have occurred after 240 minutes? ** If the doubling time is 20 minutes, then after 240 minutes, the number of bacteria would have doubled 240/20=<<240/20=12>>12 times.
How many bacterial cells will there be after the culture is grown for 4 hours? ** 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
#### 4,096