Tools and Techniques in Microbiology Lab

The wavelength of light used plus the numerical aperture governs

• resolution

• magnification

• size of the field

• illumination

The specimen preparation that is best for viewing cell motility is

• Gram stain

• flagellar stain

• hanging drop

• negative stain

A microbiologist decides to use a nutrient medium that contains thioglycolic acid. What type of microbe is she attempting to culture?

• fastidious

• gram positive

• gram negative

• anaerobe

A pure culture contains only

• a variety of microbes from one source

• one species of microorganism

• bacteria

• all of these are correct

Mannitol salt agar is selective for which bacterial genus?

• Streptococcus

• Escherichia

• Staphylococcus

• Neisseria

If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?

• 100X

• 95X

• 850X

• 950X

A bacterial cell that is deposited on the surface of an appropriate solid growth media will divide repeatedly until it forms a visible accumulation of bacterial growth. This is known as a bacterial

• community

• biofilm

• colony

• smear

Which part of the microscope holds and allows selection of the objective lenses?

• nosepiece

• stage

• coarse objective

• diaphragm

To prepare large volumes of influenza virus for use in the flu vaccines each year, the virus is grown in embryonated hen eggs. This is an example of the use of

• live media

• enriched media

• complex media

• selective media

A medium that is gel-like has less agar in it compared to a solid medium.

• True

• False