Waec Model Questions Vol1 2022 Biology Question 37
Practice objective / multiple choice question 37 from the 2022 Waec Model Questions Vol1 Biology examination.
A bacterial culture contains 10⁹ cells. Antibiotic A kills 99.9 % of the cells; the surviving 0.1 % includes a resistant mutant at a frequency of 1 in 10⁵. The survivors are then exposed to antibiotic B, which kills 99.5 % of the cells; among the survivors the frequency of B‑resistance is 1 in 10⁴. What is the probability that a randomly chosen cell from the original population will be resistant to both antibiotics after the two exposures? Express your answer in scientific notation.
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This is Waec Model Questions Vol1 2022 Biology Question 37. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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