GATE XL · 2025 · XL-S
Question 83: Parasitology and Immunology
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Question 83
XL-SNAT2 marksNeeds review
The doubling time of Escherichia coli is 30 minutes in a culture medium containing glucose and yeast extract. Phage T7 has a life cycle of 20 minutes and a burst size of 200 phage per infected E. coli cell. Phage absorption is instantaneous and occurs at 1 multiplicity of infection (MOI). Bacteria infected with multiple or single phage give the same burst. 5000 plaque forming units of T7 phage are added to a culture of 2 × 10⁷ E. coli cells.
Assuming normal division, the E. coli culture will lyse completely by _____ full cycles of bacterial division.
(Answer in integer)
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2025XL-S
GATE XL 2025 · Paper 1
Life Sciences · Original paper archive
- Section
- Section XL-S
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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