Igcse Model Questions Vol1 2017 Biology Question 17

Practice objective / multiple choice question 17 from the 2017 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2017 Biology Objective / Multiple Choice Hard Difficulty
Question 17 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • objective

A bacterial culture grows exponentially. After 2 h the population is \(5\times10^{6}\) cells and after 5 h it is \(4\times10^{7}\) cells. (a) Assuming a constant growth rate, calculate the doubling time in minutes. (b) If an antibiotic reduces the growth rate by 30 %, what is the population after 5 h under the antibiotic?

Answer Options

A. Doubling time = 60 minutes; population ≈ 9.0×10⁶ cells
Correct Answer B. Doubling time = 60 minutes; population ≈ 1.4×10⁷ cells
C. Doubling time = 80 minutes; population ≈ 1.0×10⁷ cells
D. Doubling time = 45 minutes; population ≈ 2.0×10⁷ cells
Correct Answer
B
Correct Option:
Doubling time = 60 minutes; population ≈ 1.4×10⁷ cells

About This Question

This is Igcse Model Questions Vol1 2017 Biology Question 17. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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