Discussion
How long would that culture take to grow from 1,000 to about 256,000 cells?
Answer: A
Correct answer: 2 hours 40 minutes
The culture doubles every 20 minutes, and \[ \frac{256{,}000}{1{,}000} = 256 = 2^8, \] so eight doublings are needed: \( 8 \times 20 = 160 \) minutes, or 2 hours 40 minutes. Recognising 256 as a power of two turns the whole calculation into a count of doublings and removes any need for logarithms.
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