Would a syringe filter with a pore size of 0.22 micrometers be able to completely remove all microorganisms including viruses? Explain why or why not?

What is the difference and compare the light source and path of light of a immunofluorescence microscope from a compound light microscope?

Using absorbance readings and a standard curve relating absorbance to cell number, you suspect that a bacterial culture contains 7.4 x 109 CFUs/ml. What dilution of this sample would give you a countable plate?

In less than 10 words, answer the following question.   What would happen if you increased the MALDI-ToF laser pulse length from 1 ns to 1 ms?

In performing the Kirby-Bauer procedure in a clinical laboratory setting, why must the agar be a certain depth? Why must the absorbance of the inoculum be standardized?

When loading samples onto a gel, why should expelling all the liquid in the tip be avoided?   a)All the sample could be forced out from the well in which it was loaded.   b)The extra liquid would end up in the buffer and this would distort the migration of the sample.   c)The gel could tear and distort the migration of the sample.   d)An air bubble could result which would distort the migration of the sample .

why In spread-plate technique, the bacterial suspension volume  should not exceed 0.1ml.

Electron microscopy of an aquatic sample of unknown origin revealed microscopic entities appearing as 20-sided polyhedral structures. The structures were determined to each have a sıze dimension of 25 nanometers x 35 nanometers; a nucleus was not visible. Of the choices given below, you can be reasonably certain that these are some type of. A) O archaea species B) O algal species C) O fungal species D) O bacterial species E) O virus

).  Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This type of medium would be referred to as a(n): A) Selective medium. B) Differential medium. C) Enrichment culture. D) Selective and differential medium. E) Differential and enrichment culture.

Which of the following is TRUE about immunofluorescence microscopy where we localize proteins using fluorescently tagged antibodies? Pick the best answer: We can use it to resolve 2 points that are 10 nanometers apart. The emission wavelength of the fluorophore is typically shorter than the excitation wavelength. The resolution can be further improved with increased magnification. All else being equal, a fluorophore that emits red light will give better resolution than a fluorophore that emits green light. Based on what we discussed in class, we can use the technique on live samples therefore enabling us to see the dynamic movement of cytosolic proteins in living cells. None of the above