Gce Model Questions Vol1 2020 Biology Question 39

Practice objective / multiple choice question 39 from the 2020 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2020 Biology Objective / Multiple Choice Hard Difficulty
Question 39 GCE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • objective

A bacterial culture is monitored by measuring optical density at 600 nm (\(\text{OD}_{600}\)). The recorded values are: 0 h = 0.05, 2 h = 0.20, 4 h = 0.80, 6 h = 3.20. (a) Assuming exponential growth up to 6 h, calculate the specific growth rate \(\mu\) (h\(^{-1}\)). (b) Determine the generation (doubling) time. (c) An antibiotic added at 6 h reduces the specific growth rate by 40 %. What is the expected \(\text{OD}_{600}\) after a further 4 h (i.e. at 10 h)?

Answer Options

A. Specific growth rate \(\mu \approx 0.577\) h⁻¹; generation time ≈ 1.2 h; \(\text{OD}_{600}\) at 10 h ≈ 12.5.
B. Specific growth rate \(\mu \approx 0.800\) h⁻¹; generation time ≈ 0.9 h; \(\text{OD}_{600}\) at 10 h ≈ 20.3.
Correct Answer C. Specific growth rate \(\mu \approx 0.693\) h⁻¹; generation time ≈ 1.0 h; \(\text{OD}_{600}\) at 10 h ≈ 16.9.
D. Specific growth rate \(\mu \approx 0.693\) h⁻¹; generation time ≈ 1.0 h; \(\text{OD}_{600}\) at 10 h ≈ 13.5.
Correct Answer
C
Correct Option:
Specific growth rate \(\mu \approx 0.693\) h⁻¹; generation time ≈ 1.0 h; \(\text{OD}_{600}\) at 10 h ≈ 16.9.

About This Question

This is Gce Model Questions Vol1 2020 Biology Question 39. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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