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How to culture microorganisms safely
Use sterilised Petri dishes and agar, inoculate using a sterile loop, seal lid with tape, incubate at 25°C.
Why is culture incubated at 25°C in school labs?
Reduces risk of growing harmful human pathogens.
Why sterilise equipment before use?
To kill any contaminating microbes.
Why tape but not seal Petri dish completely?
Allows oxygen in to prevent growth of anaerobic, potentially harmful bacteria.
How to calculate area of clear zones (antibiotic effect)
Area = π × radius².