Which type of light microscope is the most widely used and shows cells against a bright background?
Which type of light microscope is the most widely used and shows cells against a bright background?
brightfield microscope
Under the brightfield microscope, the technician can barely see the bacteria cells because they are nearly transparent against the bright background.
Which type of plating technique allows you to enumerate the number of organisms in your culture?
Which type of plating technique allows you to enumerate the number of organisms in your culture? Dark-field microscopy is utilized in the diagnosis of the primary stage of this disease. The closest spacing between two points at which they can still be seen clearly as separate entities.
Which term refers to the microscope’s ability to show do you separate objects as discrete and distinct?
inoculation. Which term refers to the microscope’s ability to show two separate objects as discrete and distinct? Resolution.
Which is incorrect about chocolate agar?
28. Which is incorrect about chocolate agar? It has chocolate extract in it.
How does the resolving power of microscope depends on the wavelength of light used?
Solution : Resolving power, R = `(2musin theta)/(lambda)` (i) Resolving power of a microscope varies inversely with the wavelength of the light used. Resolving power of a microscope is directly proportional to the refractive index of the medium used between the object and the objective lens.
What is streak plate used for?
The purpose of the streak plate is to obtain isolated colonies from an inoculum by creating areas of increasing dilution on a single plate. Isolated colonies represent a clone of cells, being derived from a single precursor cell.
Which of the following method can be used to determine the number of bacteria quantitatively?
3. Which of the following method can be used to determine the number of bacteria quantitatively? Explanation: Due to a higher degree of dilution, pour-plate and spread-plate techniques may be performed in a quantitative manner to determine the number of bacteria present in a specimen.
Which type of medium is used to distinguish different species or types of microorganisms based on an observable change in the colonies or in the medium?
Chemically defined media contain only chemically known components. Selective media favor the growth of some microorganisms while inhibiting others. Differential media help distinguish bacteria by the color of the colonies or the change in the medium.
Which of the following magnifies the specimen to produce its real image?
The objective lens is nearer the specimen and magnifies it, producing the real image that is projected up into the focal plane and then magnified by the ocular lens to produce the final image.
Which type of medium distinguishes different types of micro organisms based on an observable change in the colonies are in the medium?
Cards
| Term The five I’s of studying microorganisms include all of the following except | Definition infection |
|---|---|
| Term Which type of medium is able to distinguish different species or types of microorganisms based on an observable change in the colonies or in the medium? | Definition differential |
What do Gram stain acid fast stain and Endospore stain have in common?
What do the Gram stain, acid-fast stain, and endospore stain have in common? They are used on a wet mount of the specimen. They use heat to force the dye into cell structures. The outcome is based on cell differences.