Igcse Model Questions Vol1 2022 Biology Question 9
Practice objective / multiple choice question 9 from the 2022 Igcse Model Questions Vol1 Biology examination.
A bacterial culture contains \(1 \times 10^{9}\) cells. The mutation rate that confers resistance to antibiotic X is \(2 \times 10^{-8}\) per cell per generation, and each generation lasts 20 minutes. After five generations, a plasmid that carries an additional resistance gene can be acquired by any mutant cell with probability \(1 \times 10^{-4}\). (a) Calculate the expected number of cells that have acquired both resistances after the five generations. (b) Assuming the number of fully resistant cells follows a Poisson distribution, calculate the probability that at least one fully resistant cell is present. Give your answer for (b) as a decimal to three significant figures.
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This is Igcse Model Questions Vol1 2022 Biology Question 9. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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