Micro Lab
Western Governors University
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Micro Lab Final 1012-91 Al-Dujaili LSUE | 100% Correct
- Exam (elaborations) • 7 pages • 2022
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Cotton plugs or screw caps are used in test tubes containing sterile media or pure 
cultures to... - -prevent unfiltered air or dust particles from entering the tubes 
-maintain anaerobic conditions 
-and prevent culture from spilling 
*all of the above* 
If the pH of the medium is higher than 7.0, you can adjust to 7.0 by: - adding drops 
of HCL to *lower* it or NaOH to *raise* it 
The pH indicator in Simmons Citrate agar is what? - Bromothymol blue 
bacteria that show no preference, grow equal...
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