Microbiology Final Exam Quiz - 2
Take this interesting and typical quiz on microbiology and associated microscopic nonliving biological particles that interact with living things
- 1.Which is (are) true concerning the cell wall of bacteria?
- A.
It determines the shape of the bacteria
- B.
It prevents the bacteria from lysis
- C.
It contains peptidoglycan
- D.
It may be targeted by antibiotics such as penicillin
- E.
All of the above
- 2.Microorganisms have been very helpful in research especially because
- A.
They have relatively simple structures
- B.
Most of them have short generation time allowing data collection in a short period of time
- C.
A large population can be kept in a small space
- D.
It is easy to visualize any transfer of genetic material
- E.
A, B and C are correct
- 3.Koch's postulates for linking a specific disease with its causative agent DOES NOT include which of the folowing?
- A.
The specific causative agent must be found in every case of the disease
- B.
The disease organism must be isolated in pure culture
- C.
Inoculation of a sample of the culture into a healthy, susceptible animal must produce the same disease
- D.
Human subjects must be inoculated with the organism to assay its virulence
- E.
None of the above
- 4.What characteristic do bright-field microscope, dark-field microscopes and the differential interference contrast microscope have in common?
- A.
Visualize small molecules inside the cells
- B.
Observe living specimens
- C.
Deal with refractive index minimizing blurry images
- D.
Work with specimens with differentially staining it
- 5.Which combination of objective lenses and ocular (eyepieces) lenses prvides the observer the highest magnification?
- A.
40x objective combined with 20x ocular
- B.
100x objective combined with 10x ocular
- C.
100x objective combined with 20x ocular
- D.
20x ovjective combined with 20x ocular
- 6._____ refers to the ability to distinguish adjacent objects, and ____ refers to the capactiy of visualizing the object
- A.
Wavelength; frequency
- B.
Resolution; detection
- C.
Resolution; magnification
- D.
Frequency; resolution
- E.
Refraction; detection
- 7.The function of the immersion oil when using the 100x objective is to
- A.
Increase the refractive index, and increase the resolution
- B.
Avoid contact between the objective and the slide
- C.
Increase the refractive index and decrease the resolution
- D.
Decrease the refractive index allowing more light to reach the slide
- 8.Stains can be used to visualize
- A.
Capsules
- B.
Endospores
- C.
Cell wall
- D.
Flagella
- E.
All of the above
- 9.Which of the following is NOT paired correctly?
- A.
Fluid mosaic model; currently accepted model of cell membranes
- B.
Cell envelope; association of plasma membrane and cell wall
- C.
Nucleoid; irregular shaped region where genetic material is found
- D.
Spirillum; a rigid spiral-shaped bacterial or archaeal cell
- 10.What is the relevance of surface area-to-volume ratio?
- A.
None, there is no correlation between surface area and cell volume
- B.
When surface area-to-volume ratio decreases, nutrient uptake becomes more efficient
- C.
When surface area-to-volume ratio increases, nutrient uptake becomes more efficient
- D.
When the surface area-to-volume ratio increases, cells can easily get desiccated
- 11.Some bacteria have flagella all over their cell. this kind of arrangement is called
- A.
Monotrichous
- B.
Peritrichous
- C.
Lophotrichous
- D.
Halotrichous
- E.
Amphitrichous
- 12.Bacterial plasma membrane is embedded with several proteins that perform functions such as ___ and ___. the rigidity of the membrane is maintained by the presence of ___.
- A.
Structural support; secretin of virulence factor; hopanoids
- B.
Ion transport osmotic maintenance; sterols
- C.
Structural support; secretion of virulence factor; sterols
- D.
Fluidity; virulence; phospholipids
- E.
Ion transport; osmotic maintenance; phospholipids
- 13.Archaeal cell wall is formed by a polymer made of NAT and NAG referred to as
- A.
Murein
- B.
Pseudopeptidoglycan
- C.
Acid-fast
- D.
Lipopolysacharide
- E.
None of the above are correct
- 14.One of the answers below can NOT be counted as Pasteur's contribution to microbiology as a science
- A.
The development of the pasteurization process
- B.
Development of vaccine against smallpox
- C.
The description of a protozoan as the infection agent in silkworms causing pebrine disease
- D.
The description of the fermentation process and its results when carried out by yeast or bacteria
- 15.Which of the following is NOT a characteristic of electron microscopy?
- A.
Electron microscope images allow us to describe and visualize living specimens
- B.
The transmission electron microscope used magnetic lenses to form an image from electrons that have passed through a very thin section of a specimen
- C.
The scanning electron microscope is used to examine the surfaces of microorganismsmin great detail
- D.
Electron microscopes are able to detect and resolve particles as small as proteins
- 16.Prokaryotic cells are characterized by the
- A.
Absence of ribosomes
- B.
Absence of DNA
- C.
Absence of a membrane-limited nucleus
- D.
Absence of membranous organelles
- E.
C & D are correct
- 17.Analyzes of ribosomal RNA done in the 1970's by Carl Woes, showed major differences betwen __ and ___; both prokaryotic organisms belonging to the same kingdom
- A.
Bacteria and protists
- B.
Protists and archaea
- C.
Protist and viruses
- D.
Bacteria and archaea
- E.
Viruses and viroids
- 18.The __ and ___ vwere critical in the development of microbiology
- A.
Development of Bunsen burners; plates
- B.
Development of microscopes; development of techniques for isolating microbes
- C.
Establishment of Koch's postulates; plates
- D.
Invention of plates; loops
- 19.What kind of information is provided by isolating microorganisms from their natural environment and culturing them in the laboratory
- A.
Generation time
- B.
Nutrient requirement
- C.
Temperature requirement
- D.
Cellular shape
- E.
A, B & C are correct
- 20.Light of ___ wavelength typically will result in ___ resolution
- A.
Longer; better
- B.
Longer; poor
- C.
Medium; better
- D.
Shorter;better
- E.
Shorter;worse
- 21.Why was the belief of spontaneous generation an obstacle to the development of microbiology as a science
- A.
It would be impossible to have a sterile medium
- B.
It would be difficult to link microorganism to certain diseases
- C.
It would be hard to isolate cultures
- D.
All of the above
- 22.In some Archaea, the double layer of phospholipid membane is replaced by a ___, making the membrane____ and resistant to harch environments
- A.
Monolayer, more rigid
- B.
Triple layer, more rigid
- C.
Outer membrane, more rigid
- D.
Monolayer, less rigid
- E.
Triple layer, less rigid
- 23.Which of the following statements about endospores is NOT correct
- A.
They are resistant to heat, chemicals, radiation a desiccation
- B.
Endospore formation is triggered by lack of nutrients
- C.
Most bacteria and archaea are able to form endospores
- D.
Resistance to physical factors is due to high amount of dipocolinic acid and calcium
- 24.An evidence of early microbial life on Earth can be revealed in
- A.
Ribosomal RNA
- B.
Stromatolites
- C.
Microbial evolution
- D.
Cellular metabolism
- E.
Probionts
- 25.Bacteriological media that are composed of ingredients whose exact chemical composition are known are called
- A.
Designated
- B.
Exact
- C.
Defined
- D.
Selective
- E.
Aesthetic
Questions: 45 | Attempts: 23246 | Last updated: Aug 20, 2020
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