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A: From above question Option d (filtration) is correct.
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Q: microscope
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Q: Why do we use oil with microscope ?
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A: Answer- Detergent ensure the reaction is sterile.
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A sample must contain many microbial cells for any to be seen by microscopic examination. Why?
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- The acid fast bacterium, Mycobacterium smegmatis, is relatively safe for students to work with because of its thin cell wall. If a gram stain is to be performed on this particular microbe, it often takes the gram stain reaction. Why?Both stained and live organisms are viewed using a microscope, but what is the purpose/benefit of staining a microorganism versus not staining it?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?
- The ability to view the insides of microbes and not just the shape of the cell can be done by using extremely thin slices of the microbes along with __________ microscopes.A novice microbiology student incorrectly explains that immersion oil increases the magnification of his microscope. What is the function of immersion oil?If you spill a culture, how should you proceed in a microbiology lab?
- Why does UV light have to be directly exposed and waved around an object that needs to be disinfected and not waved around a bag with the items that need to be disinfected inside of it?As part of an experiment where absorbance values are measured using a spectrophotometer, you are taking readings of your sample every 20 minutes. The non-motile microbe you're testing has a generation time of roughly 20 minutes at an incubation temperature right around room temperature. Things start out fine, with the expected results — as time goes by at the correct incubation temperature, absorbance starts to rise as the medium starts to become more cloudy with growing microorganisms. But roughly 2 hours into the process, you notice that the absorbance levels flatten out, and then start to decrease unexpectedly. What is most likely taking place in your experiment?Agar is a complex polysaccharide obtained from seaweed and cannot be digested by most microorganisms. Why does this property make agar an excellent solidifying agent for microbiological media?