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Bacteria produce two offspring per generation. What equation describes their population growth?

N_{t}=2^{n}

N_{t}=N_{0}n^{2}

N_{t}=N_{0}2^{n}

N_{0}=N_{t}2^{n}

If ten bacterial cells double every 5 minutes, how many bacteria will there be in 30 minutes?

640

64

10^{6}

6.4 x 10^{6}

Fribbles reproduce every 6 hours in a litter of 10, then the parent dies. If you start with 3 Fribbles, which equation would you use to calculate the population size after 5 days?

N_{5 days} = 1 x 2^{20}

N_{5 days} = 3 x 6^{20}

N_{5 days} = 3 x 10^{20}

N_{5 days} = 3 x 10^{5}

Suppose 10,000 tribbles eat poisoned grain, which kills half of them every hour. How many tribbles will be alive, six hours after eating the grain?

10

625

2500

156

Suppose a piece of meat contains 100,000 Salmonella bacteria. To meet safety standards, the food must be cooked for at least three half-lives after the point at which one bacterium would theoretically be left. If half of the bacteria die after one minute of cooking, what is the shortest time below that the food must be cooked?