Gce Model Questions Vol1 2023 Biology Question 17

Practice objective / multiple choice question 17 from the 2023 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 17 GCE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

In a batch bacterial culture the initial inoculum is \(1 \times 10^{3}\) cells. After 2 h the cell count is \(8 \times 10^{4}\) cells. (a) Assuming exponential growth during this period, determine the generation time in minutes. (b) How many generations occurred in the first 2 h? (c) If the carrying capacity of the culture is \(5 \times 10^{8}\) cells and growth ceases once this number is reached, estimate the time (in hours) required to reach the carrying capacity. (d) What is the total number of cells present after 10 h under these conditions?

Answer Options

A. Generation time ≈ 15 min; generations in first 2 h ≈ 8.0; time to reach \(5\times10^{8}\) cells ≈ 5.0 h; cells after 10 h = \(5\times10^{8}\).
Correct Answer B. Generation time ≈ 19 min; generations in first 2 h ≈ 6.3; time to reach \(5\times10^{8}\) cells ≈ 6.0 h; cells after 10 h = \(5\times10^{8}\).
C. Generation time ≈ 22 min; generations in first 2 h ≈ 6.0; time to reach \(5\times10^{8}\) cells ≈ 6.8 h; cells after 10 h = \(5\times10^{8}\).
D. Generation time ≈ 25 min; generations in first 2 h ≈ 5.0; time to reach \(5\times10^{8}\) cells ≈ 7.5 h; cells after 10 h = \(5\times10^{8}\).
Correct Answer
B
Correct Option:
Generation time ≈ 19 min; generations in first 2 h ≈ 6.3; time to reach \(5\times10^{8}\) cells ≈ 6.0 h; cells after 10 h = \(5\times10^{8}\).

About This Question

This is Gce Model Questions Vol1 2023 Biology Question 17. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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