Bacteria multiply by doubling: 1 becomes 2, 2 become 4, 4 become 8. Enter a starting count, how fast the organism doubles, and how long the food stood, and see what the population could become.
Time
Generations
Possible count
This is a worst case. It assumes the organism is at its optimum the whole time and skips the lag phase, in which cells prepare to divide before the doubling starts (Lesson 6, section 6.8.1). That is exactly how a QC supervisor should size the risk before deciding to hold a batch.
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