Consider a single bacterium starting out under ideal conditions. Its generation time is 20 minutes. How many bacteria will there be two hours later?
a. 2
b. 4
c. 16
d, 64
e. 128

.
After two days of growth a single bacterium can theoretically give rise to masses of bacteria greater in bulk than the earth. What factor(s) limit their growth to less than that amount?
a. their small size
b. they always require oxygen gas, which is a limiting factor in the environment
c. their metabolic activities produce toxins
d. all of the above are correct
e .none of the above are correct

Question

Consider a single bacterium starting out under ideal conditions. Its generation time is 20 minutes. How many bacteria will there be two hours later?
a. 2 
b. 4 
c. 16 
d, 64 
e. 128

. 
After two days of growth a single bacterium can theoretically give rise to masses of bacteria greater in bulk than the earth. What factor(s) limit their growth to less than that amount? 
a. their small size 
b. they always require oxygen gas, which is a limiting factor in the environment 
c. their metabolic activities produce toxins
 d. all of the above are correct 
e .none of the above are correct