Multiple choice

During antibiotic as erythromycin production by Streptomyces erythreus the following data was collected. 1 hour (100 cells, 0 erythromycin); 5 hours (1500 cells, 15 units erythromycin); 10 hours (25,000 cells, 35 units erythromycin); 15 hours (65,000 cells, 45 units erythromycin); 20 hours (64,000 cells, 60 units erythromycin); 25 hours (50,000 cells, 50 units erythromycin).

How many cells were present in the log phase of Streptomyces erythreus?

  1. 65,000

  2. 64,000

  3. 50,000

  4. 25,000
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

25,000: log phase means when the cells are rapidly growing and at their maximum rate of division. Here log phase is in 10th hour and correspondingly, number of cells = 25,000.

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