Question

the population of bacteria in a petri dish triples every 10 minutes. the population of the bacteria is initially 400 organisms. which unit is most appropriate for the time at which the number of bacteria is 600?
o hour
o bacteria per hour
o minute
o bacteria per minute

Explanation:

Step1: Identify the question type

We are asked for the unit of time.

Step2: Analyze the context

The bacteria - growth rate is given in terms of minutes (triples every 10 minutes).

Step3: Evaluate options

"hour" is too large a unit as the growth is described in 10 - minute intervals. "bacteria per hour" and "bacteria per minute" are rates of change of bacteria population, not units of time. The most appropriate unit for the time when the number of bacteria is measured is "minute" since the growth pattern is described in 10 - minute intervals.

Answer:

minute