Waec Model Questions Vol1 2019 Biology Question 2
Practice objective / multiple choice question 2 from the 2019 Waec Model Questions Vol1 Biology examination.
A bacterial culture at 30°C has a generation time of 20 minutes. When the temperature is raised to 40°C, the generation time shortens by 25% but a lag phase of 30 minutes precedes exponential growth. Starting with 1,000 cells, a bacteriophage infection occurs exactly 2 hours after inoculation, killing 90% of the cells instantly. The culture is then allowed to continue growing for a total of 3 hours at 40°C. Assuming first‑order growth after the lag phase, how many viable cells are present at the end of the 3‑hour period?
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About This Question
This is Waec Model Questions Vol1 2019 Biology Question 2. It is a objective / multiple choice question from the 2019 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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