Gce Model Questions Vol1 2023 Biology Question 19

Practice objective / multiple choice question 19 from the 2023 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 19 GCE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

A bacterial population of \(1 \times 10^{8}\) cells is exposed to an antibiotic. The spontaneous mutation rate that confers resistance is \(1 \times 10^{-8}\) per cell division. Each cell divides once per hour and the culture is maintained for 24 h. (a) Estimate the expected number of resistant mutants after 24 h. (b) Assuming a Poisson distribution, give the probability that at least one resistant mutant is present after 24 h. (c) If a subculture of \(1 \times 10^{6}\) cells is taken from the 24‑h culture, what is the probability that this subculture contains at least one resistant cell?

Answer Options

A. (a) ≈ 3.2 × 10⁷ resistant mutants; (b) probability ≈ 0.99 (≈99 %); (c) probability ≈ 0.02 (≈2 %).
B. (a) ≈ 2.4 × 10⁶ resistant mutants; (b) probability ≈ 0.95 (≈95 %); (c) probability ≈ 0.05 (≈5 %).
Correct Answer C. (a) ≈ 1.68 × 10⁷ resistant mutants; (b) probability ≈ 1 (≈100 %); (c) probability ≈ 0.01 (≈1 %).
D. (a) ≈ 5.0 × 10⁶ resistant mutants; (b) probability ≈ 0.90 (≈90 %); (c) probability ≈ 0.001 (≈0.1 %).
Correct Answer
C
Correct Option:
(a) ≈ 1.68 × 10⁷ resistant mutants; (b) probability ≈ 1 (≈100 %); (c) probability ≈ 0.01 (≈1 %).

About This Question

This is Gce Model Questions Vol1 2023 Biology Question 19. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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