Prince George Community College » Biology » Bio 2010 - Microbiology » Summer 2022

Question #1

The magnification of an ocular lens in our lab is 10X. If the scanning lens is used when viewing a specimen, the total magnification would be

A. 1000X

B. 400X

C. 100X

D. 40X

Question #2

We use immersion oil between the 100X lens and the slide to prevent refraction of light because

A. immersion oil has the same refractive index as glass.

B. the source of illumination on our microscopes is not bright enough.

C. immersion oil increases the depth of field.

D. immersion oil has the same refractive index as air.

Question #3

What is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?

A. 100x

B. 4.5x

C. 450x

D. 45x

E. 10x

Question #4

Brownian motion is

A. the random vibration of molecules and small objects caused by bombardment of these objects by water molecules that are constantly in motion.

B. the result of the true directional movement of a bacterial cell.

C. another term for condensation.

D. a form of behavior commonly seen in bacterial cells that are motile.

Question #5

__________ is the term we use to describe simple bacterial behaviors such as moving toward or away from a stimulus.

A. Run

B. Tumble

C. Taxis

D. Brownian motion

Question #6

The substance we use to solidify a liquid medium is called

A. gelatin.

B. salt.

C. protein.

D. agar.

Question #7

At what temperature does agar normally solidify?

A. 50 oC

B. 100 oC

C. 40 oC

D. 45 oC