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Let's assume you start with one bacterium:

Step by step this gives you:

½ hour: 2

1 hour: 4

1½ hours: 8

2 hours: 16

2½ hours: 32

3 hours: 64

3½ hours: 128

4 hours: 256

You will notice that the number doubles each hour. So you can just apply the formula: bacteria = 2t, where t is the number of time periods. In this case we have 8 half-hours, so that's 28, or 256.

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Q: How many bacteria are produced in four hours if a bacteriaum divides once in half an hour?
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Related questions

How does a certain bacterium divide every 30 min to get 1000 bacteria?

The bacterium undergoes binary fission, where it duplicates its genetic material and divides into two daughter cells. This process repeats every 30 minutes, resulting in exponential growth. After 10 cycles (5 hours), one bacterium will have produced 1000 bacteria.


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It depends on the species of bacteria as some divide more rapidly than others.


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After 4 hours, as the bacterium doubles every 30 minutes, resulting in 8 divisions within this time frame. Starting with 1 bacterium, this will lead to 28 = 256 bacteria after 4 hours.


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After 24 hours, the single bacterium would have undergone 48 divisions (24 hours x 60 minutes/hour รท 30 minutes/division). Therefore, the single colony would contain 2^48 bacteria, which is 281,474,976,710,656 bacteria.


A bacteria splits in half after 20 minutes so that after 20 minutes there are 2 bacteria and after 40 minutes there are 4 bacteria How many bacteria will there be after 2 hours?

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