Gce Model Questions Vol1 2023 Biology Question 43

Practice objective / multiple choice question 43 from the 2023 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 43 GCE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

A bacterial culture starts with \(5\times10^{3}\) cells. After 4 h the count is \(8\times10^{5}\) cells, and the growth is exponential.\n(a) Determine the generation time (in hours).\n(b) Predict the cell number after 10 h if the growth conditions remain unchanged.\n(c) An antibiotic is added at hour 6 that reduces the growth rate by 30 %. What is the cell number at hour 10 under this new condition?

Answer Options

A. Generation time ≈ 0.45 h; N(10 h) ≈ 1.2×10⁹ cells; N(10 h) with antibiotic ≈ 2.8×10⁸ cells
B. Generation time ≈ 0.75 h; N(10 h) ≈ 2.3×10⁹ cells; N(10 h) with antibiotic ≈ 5.0×10⁸ cells
Correct Answer C. Generation time ≈ 0.55 h; N(10 h) ≈ 1.6×10⁹ cells; N(10 h) with antibiotic ≈ 3.5×10⁸ cells
D. Generation time ≈ 0.60 h; N(10 h) ≈ 1.0×10⁹ cells; N(10 h) with antibiotic ≈ 4.2×10⁸ cells
Correct Answer
C
Correct Option:
Generation time ≈ 0.55 h; N(10 h) ≈ 1.6×10⁹ cells; N(10 h) with antibiotic ≈ 3.5×10⁸ cells

About This Question

This is Gce Model Questions Vol1 2023 Biology Question 43. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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