Microbiology Chapter 4 potential test questions

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1

Which of the following is the smallest?

  1. decimeter
  2. millimeter
  3. nanometer
  4. micrometer

c. nanometer

2

A nanometer is __________ than a micrometer

  1. 10 x larger
  2. 10 x smaller
  3. 1000 x larger
  4. 1000 x smaller

d. 1000 x smaller

3

Resolution is best described as _________

  1. the ability to view something that is small
  2. the ability to magnify a specimen
  3. the ability to distinguish between two adjacent objects
  4. the difference between two waves of electromagnetic radiation

c. the ability to distinguish between two adjacent objects

4

Curbed glass lenses _________ light.

  1. refract
  2. bend
  3. magnify
  4. both a and b

d. both refract and bend

5

Which of the following factors is important in making an image appear larger?

  1. the thickness of the lens
  2. the curvature of the lens
  3. the speed of the light passing through the lens
  4. all of the above

d. all of the above

6

which of the following is different between light microscopy and transmission electron microscopy?

  1. magnification
  2. resolution
  3. wavelengths
  4. all of the above

d. all of the above

7

Which of the following types of microscopes produces a three dimensional image with a shadowed appearance?

  1. simple microscope
  2. differential interference contrast microscope
  3. fluorescent microscope
  4. transmission electron microscope

b. differential interference contrast microscope

8

Which of the following microscopes combines the greatest magnification with the best resolution?

  1. confocal microscope
  2. phase-contrast microscope
  3. dark-field microscope
  4. bright-field microscope

a. confocal microscope

9

Negative stains such as eosin are also called _______________________.

  1. capsule stains
  2. endospore stains
  3. simple stains
  4. acid fast stains

a. capsule stains

10

In the binomial system of nomenclature, which term is always written in lowercase letters?

  1. kingdom
  2. domain
  3. genus
  4. specific

d. specific epithet

11

If an object magnifies 40 x and each binocular lens magnifies 15 x, the total magnification of the object being viewed is _____________.

600 x

12

The type of fixation developed by Koch for bacteria is ___________________.

heat fixation

13

Immersion oil ___________ (increases/decreases) the numerical aperture, which _______________(increases/decreases) resolution because ______________ (more/fewer) light rays are involved.

increases

increases

more

14

___________ refers to differences in intensity between two objects

contrast

15

Cationic chromophores such as mthylene blue ionically bond to ______________ (positively/negatively) charged chemicals such as DNA and proteins.

negatively