Neco Model Questions Vol1 2024 Biology Question 39

Practice objective / multiple choice question 39 from the 2024 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2024 Biology Objective / Multiple Choice Hard Difficulty
Question 39 NECO_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • objective

A bacterial culture starts with \(2\times10^{3}\) CFU/mL. After 2 hours the count is \(1.6\times10^{5}\) CFU/mL.\ (a) Assuming exponential growth, calculate the generation time in minutes.\ (b) If an antibiotic reduces the growth rate by 30%, what will be the viable count after the same 2‑hour period?\ (c) The bacteria produce an enzyme whose concentration (and thus absorbance) doubles each generation. If the initial absorbance is 0.05, what is the absorbance after 4 generations under normal conditions?

Answer Options

A. Generation time ≈ 25 min; viable count ≈ 2.5×10^4 CFU/mL; absorbance = 0.60
B. Generation time ≈ 30 min; viable count ≈ 3.2×10^4 CFU/mL; absorbance = 0.70
Correct Answer C. Generation time ≈ 19 min; viable count ≈ 4.3×10^4 CFU/mL; absorbance = 0.80
D. Generation time ≈ 15 min; viable count ≈ 6.0×10^4 CFU/mL; absorbance = 1.00
Correct Answer
C
Correct Option:
Generation time ≈ 19 min; viable count ≈ 4.3×10^4 CFU/mL; absorbance = 0.80

About This Question

This is Neco Model Questions Vol1 2024 Biology Question 39. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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