[Skip Breadcrumb Navigation]
[Skip Breadcrumb Navigation]
Chapter 4: Microscopy, Staining, and Classification
This activity contains 20 questions.
If you wanted to determine if a microorganism fermented a particular carbohydrate, which of the following kinds of tests would you use?
A. biochemical tests
C. phage typing
Put the following units of measurement in order, from largest to smallest:
A. IV, II, I, III, V
B. III, V, I, II, IV
C. V, III, II, I, IV
D. V, III, I, II, IV
Which of the following has the shortest wavelength?
A. white light
B. violet light
C. red light
D. an electron beam
In microscopy, which of the following plays an important role in visualizing extremely small objects clearly?
A. wavelength of radiation used
B. numerical aperture of the lens
C. contrast between the specimen and its background
D. Both A and C are correct.
E. Answers A, B, and C are correct.
Which of the following types of microscope is being used to examine the relationships between microbes in biofilms on stromatolites?
A. transmission electron
B. scanning electron
D. scanning tunneling
All of the following are components of a bright-field compound microscope EXCEPT:
A. the condenser lens.
B. the oil immersion objective lens.
C. the scanning objective lens.
D. the phase plate.
The limit of useful magnification for a light microscope is
All of the following types of microscope can be used to view living specimens EXCEPT
A. an atomic force microscope.
B. a bright-field microscope.
C. an electron microscope.
D. a dark-field microscope.
Which of the following stains is used for visualizing
A. Acid-fast stain
B. Negative stain
C. Endospore stain
D. Gram stain
In the Gram stain, crystal violet serves as the
C. decolorizing agent.
D. primary stain.
In the Gram stain, which of the reagents actually differentiates between Gram positive and Gram negative cells?
C. Crystal violet
All of the following statements concerning taxonomy are true EXCEPT:
A. Species of asexual organisms are defined as collections of strains.
B. Each taxon includes all of the taxa above it.
C. The genus name and the specific epithet together are called a binomial.
D. All taxa have Latin names.
O157:H7 is a result of which type of microbial identification process?
A. phage typing
D. biochemical tests
The domain, a taxon proposed by Carl Woese, contains or replaces which of the following taxonomic groups?
A. the phylum
B. the genus
C. the order
D. the kingdom
Which of the following taxonomic groupings was NOT part of the traditional Linnaean system of classification?
Which of the following staining procedures is useful for visualizing endospores?
A. Osmium tetraoxide
Which of the following combinations would give the best microscopic resolution?
A. Large numerical aperture lens, long wavelength radiation
B. Small numerical aperture lens, long wavelength radiation
C. Large numerical aperture lens, short wavelength radiation
D. Small numerical aperture lens, short wavelength radiation
All of the following are aspects of scanning electron microscopy EXCEPT:
A. Specimens must be placed into a vacuum.
B. Whole specimens can be observed.
C. Secondary electrons are used to visualize the specimen.
D. Scanning electron micrographs typically appear two-dimensional.
Which of the following is a true statement concerning basic dyes?
A. Basic dyes work best at a low pH.
B. Basic dyes are attracted to the negatively-charged surface of cells.
C. Eosin is an example of a basic dye.
D. Basic dyes are also known as anionic chromophores.
What is the purpose of fixation in smear preparation?
A. It enables cells to take up more stain.
B. It temporarily keeps cells from growing.
C. It attaches cells firmly to the slide's surface.
D. It keeps cells from drying out during staining.
The Clear Answers feature requires scripting to function. Your browser either does not support scripting or you have turned scripting off. So, the Clear Answers feature will not work. Note that you do not need to use the Clear Answers feature in order to use this site. You can change your answers for each question individually.
Your browser either does not support scripting or you have turned scripting off. Because of this, the answer choices will NOT appear in a different order each time the page is loaded, though that is mentioned below. Note that you do not need this feature to use this site.
Answer choices in this exercise appear in a different order each time the page
Copyright © 1995 - 2011
. All rights reserved. Pearson Benjamin Cummings is an imprint of
[Return to the Top of this Page]