Laboratory Experiments in Microbiology (11th Edition)
11th Edition
ISBN: 9780321994936
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Chapter 6, Problem 2Q
Why were you instructed to discard the toothpick in disinfectant?
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Laboratory Experiments in Microbiology (11th Edition)
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- A food sample with an unknown number of contaminating bacteria was serially diluted to 10-6. A volume of 0.1 mL (100 μL) of the dilutions was plated. The 10-6 plate contained 96 colonies. What was the original microbial concentration?arrow_forwardWhy must alcohol be diluted with water to about 70 % percent before it could be used as an effective disinfectant. What is the chemistry behind it?arrow_forwardSerial dilution is recommended prior to pour and spread plate. Why is this so?arrow_forward
- Tell me three things about how cultures are handled in a clinical laboratory.arrow_forwardIn the preparation of a bacterial smear, why is there a need to fix the bacteria to the slide? Aside from passing the slide over a flame, what are the other ways of fixing the bacteria to the slide?arrow_forwardIf each agar plate contained 20 ml of LB agar and had an ampicillin concentration of 150 ug/ml, what is the approximate amount of ampicillin (grams) in each plate?arrow_forward
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