A urine sample with more than 100,000 organisms is considered indicative of infection.A urine sample containing 5,000 bacteria,with a generation time of 30 minutes,sits for 3 hours before finally being assayed.How many bacteria will then be present within the sample?
A)10,000
B)64,000
C)100,000
D)320,000

Question

Quizplus · Accepted Answer

The generation time of 30 minutes means that every 30 minutes, the number of bacteria in the sample doubles. 
After 1 hour (two 30-minute intervals), the number of bacteria would be 5,000 x 2 x 2 = 20,000. 
After 2 hours (four 30-minute intervals), the number of bacteria would be 5,000 x 2 x 2 x 2 x 2 = 80,000. 
After 3 hours (six 30-minute intervals), the number of bacteria would be 5,000 x 2 x 2 x 2 x 2 x 2 x 2 = 320,000. 
Therefore, the correct answer is D (320,000 bacteria).

A Urine Sample with More Than 100,000 Organisms Is Considered