8) All of the following methods/equipments can be used to measure viable cell co

Question

8) All of the following methods/equipments can be used to measure viable cell count EXCEPT A) plate count method B) spectrophotometer. C) MPN method. D) filtration E) all of the above can be used to measure viable cell count. 9) During normal aerobic respiration, aerobes possess_to remove toxic oxygen species, superoxide radicals and hydrogen peroxide. A) only superoxide dismutase B) superoxide dismutase and catalase C) only catalase D) peroxidase E) vitamin E 10) You have isolated a microbe from soil. It can grow in a liquid medium containing glucose as a sole carbon source. This microbe is alan. A) mutant B) auxotroph C) prototroph D) autotroph E) heterotroph 11) You have mutated the microbe you isolated in question 10 into the one that requires an amino acid tryptophan in addition to glucose. This microbe is now a(an)__. A) trp autotroph B) trprototroph C) trp heterotroph D) trp auxotroph E) none of the above

Explanation / Answer

8) Viable cell count is the quantitative measurement of presence of microorganisms such as bacteria, parasites, yeasts and molds in a sample. There are various techniques to measure cell count. Some of them are plate count, most probable number (MPN) method, filtration and spectrophotometer. Therefore, the answer for this question is option E.

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