Igcse Model Questions Vol1 2022 Biology Question 20
Practice objective / multiple choice question 20 from the 2022 Igcse Model Questions Vol1 Biology examination.
A bacterial culture shows the following viable counts (CFU ×10⁶) at 30‑minute intervals: \nTime (min): 0 30 60 90 120 CFU (×10⁶): 2 8 32 128 512\n\n(a) Assuming exponential growth, determine the generation time in minutes.\n(b) After 120 min an antibiotic is added that reduces the specific growth rate by 40 % (the new rate is 0.6 of the original). Predict the CFU count after a further 60 minutes (i.e., at 180 min). Give your answer in scientific notation to two significant figures.
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This is Igcse Model Questions Vol1 2022 Biology Question 20. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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