Gce Model Questions Vol1 2017 Biology Question 50
Practice objective / multiple choice question 50 from the 2017 Gce Model Questions Vol1 Biology examination.
A bacterial culture contains 10⁸ cells. Initially 0.01 % of the cells carry a plasmid that confers resistance to antibiotic X. During conjugation each resistant cell can attempt to transfer the plasmid to 5 susceptible cells per hour, and each attempt succeeds with probability 0.6. Conjugation proceeds for 3 hours. After conjugation the culture undergoes six generations (each generation lasts 30 min) during which the plasmid is lost at a rate of 5 % per generation. Finally, antibiotic X is added, killing all cells that do not possess the resistance plasmid. Estimate the number of resistant cells that survive the antibiotic treatment.
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This is Gce Model Questions Vol1 2017 Biology Question 50. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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