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- Of what practical importance are air borne microorganisms to the laboratory workers? What precautions should be taken to control laboratory contaminants? Why are petri dishes incubated in an inverted position? Of what advantage is the using a solid and a liquid medium?What are the disadvantages of doing a total microbial count by examining wet mounts under the microscope?After the mordant has been added, Gram-positive organisms are stained __________ and Gram-negative organisms are stained __________. A)purple;pink B)purple;purple C)purple;colorless D) pink;pink
- What is the difference between sterilization and disinfection? For lab applications which is preferred?What is the difference between a mixed culture and a contaminated culture if they both contain more than one type of organism ?Can you describe a situation where high-level disinfection would be needed? Medium-level? Low-level?
- Why should you filter some liquids for sterilization, rather than autoclaving them?If a yellow halo is present around a colony on a mannitol salt agar (MSA) plate, the bacterium cannot ferment mannitol.Of what practical importance are air borne microorganisms to the laboratory workers? What precautions should be taken to control laboratory contaminants? What precautions should be taken to control laboratory contaminants? Of what advantage is the using a solid and a liquid medium?