Question 1

Which of the following statements best describes the difference between the domains Bacteria and Archaea in the Three Domain System?

Accepted Answer

Bacteria have peptidoglycan in their cell walls, while Archaea lack peptidoglycan and often live in extreme environments.

Question 2

Which scientist is credited with developing the system of scientific nomenclature that assigns each organism a genus and specific epithet?

Accepted Answer

Carolus Linnaeus

Question 3

A microbiologist discovers a unicellular organism with chitin cell walls that absorbs organic chemicals for energy. Which group does this organism most likely belong to?

Accepted Answer

Fungi

Question 4

Which of the following is NOT a characteristic of viruses?

Accepted Answer

They have peptidoglycan cell walls.

Question 5

Which experiment most definitively refuted the theory of spontaneous generation?

Accepted Answer

Louis Pasteur's swan-neck flask experiment

Question 6

Which of the following correctly matches the scientist with their contribution to microbiology?

Accepted Answer

Robert Koch - developed postulates to prove a specific microbe causes a specific disease

Question 7

Which of the following equations best represents the size relationship between a typical virus, bacterium, and plant cell?

Accepted Answer

$$100 \ \mathrm{nm} \u003c 1 \ \mu\mathrm{m} \u003c 10 \ \mu\mathrm{m}$$

Question 8

Which of the following is a correct application of Koch’s postulates in identifying the causative agent of a disease?

Accepted Answer

Demonstrate that the microbe is present in all cases of the disease and absent from healthy individuals.

Question 9

Which of the following best explains why MRSA (Methicillin-resistant Staphylococcus aureus) is a major concern in healthcare settings?

Accepted Answer

MRSA is resistant to multiple antibiotics, including methicillin and sometimes vancomycin.

Question 10

Which of the following is a real-world example of microbial ecology?

Accepted Answer

Bacteria recycling carbon, nutrients, sulfur, and phosphorus for use by plants and animals.

Question 11

Which of the following statements about scientific names is correct?

Accepted Answer

After the first use, scientific names may be abbreviated with the first letter of the genus and the full specific epithet.

Question 12

Which of the following organisms is most likely to be found in extreme environments such as hot springs or salt lakes?

Accepted Answer

Archaea

Question 13

Which of the following is the correct chronological order of major events in the history of microbiology?

Accepted Answer

Pasteur refutes spontaneous generation, Koch develops postulates, Fleming discovers penicillin

Question 14

Which of the following is NOT a type of microorganism studied in microbiology?

Accepted Answer

Plants

Question 15

Which of the following best describes the process of fermentation as investigated by Pasteur?

Accepted Answer

Fermentation is caused by living microorganisms converting sugars to alcohol or acids.

Question 16

Which of the following is a correct statement about antibiotics?

Accepted Answer

Antibiotics are chemicals produced by bacteria and fungi that inhibit or kill other microbes.

Question 17

Which of the following is a correct application of the scientific method in Pasteur’s investigation of fermentation?

Accepted Answer

He designed experiments to test whether living organisms were responsible for fermentation.

Question 18

Which of the following is the correct scientific name format for the bacterium found in the large intestine?

Accepted Answer

Escherichia coli

Question 19

Which of the following is a correct statement about the size of microorganisms?

Accepted Answer

A typical virus is about 100 nm, which is 10 times smaller than a typical bacterium.

Question 20

Which of the following is a correct example of immunity as described in the history of microbiology?

Accepted Answer

Edward Jenner inoculated a person with cowpox virus, who was then protected from smallpox.

Introduction to Microbiology: Classification and Diversity of Microorganisms

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