A bacterium divides every 36 minutes. If a culture containing 105 cells/ml is grown for 180 minutes, what will be the cell concentration after that period?
Correct answer: D. 32 x 10^5
- A. 175 x 10^5
- B. 5 x 10^5
- C. 35 x 10^5
- D. 32 x 10^5
Explanation
To calculate the cell concentration after a certain period of growth, you can use the formula: Final cell concentration = Initial cell concentration × 2(number of divisions) In this case, the bacterium divides every 36 minutes, so it doubles its population every 36 minutes. The initial cell concentration is 105 cells/ml, and the growth period is 180 minutes. Number of divisions = Growth period / Division time = 180 minutes / 36 minutes/division = 5 divisions. Now, plug the values into the formula: Final cell concentration = 105 cells/ml × 25 = 105 cells/ml × 32 = 32 x 105 cells/ml. So, the correct answer is 32 x 105 cells/ml.
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Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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