Question 1

Which of the following statements best describes the difference between 'microbe' and 'germ'?

Accepted Answer

Germs are rapidly growing cells, while microbes include all organisms too small to be seen with the unaided eye.

Question 2

Which of the following is NOT a role of microbes in the environment?

Accepted Answer

Producing carbon dioxide as a primary product of photosynthesis

Question 3

A scientist discovers a unicellular organism with a chitin cell wall and a distinct nucleus. Which group does this organism most likely belong to?

Accepted Answer

Fungi

Question 4

Which of the following correctly describes the scientific naming convention established by Carolus Linnaeus?

Accepted Answer

The genus is capitalized, the specific epithet is lowercase, and both are italicized or underlined.

Question 5

Which of the following statements about viruses is TRUE?

Accepted Answer

Viruses are acellular and can only replicate inside a living host cell.

Question 6

Which domain includes organisms that lack peptidoglycan in their cell walls and often live in extreme environments?

Accepted Answer

Archaea

Question 7

Louis Pasteur's experiments with S-shaped flasks provided evidence against which hypothesis?

Accepted Answer

Spontaneous generation

Question 8

Which process is defined as the microbial conversion of sugar to alcohol in the absence of air?

Accepted Answer

Fermentation

Question 9

A patient is infected with a bacterium that is resistant to methicillin and vancomycin. Which abbreviation best describes this strain?

Accepted Answer

VRSA

Question 10

Which of the following is a correct application of Koch’s postulates?

Accepted Answer

Demonstrating that a specific microbe causes a specific disease by isolating the microbe and infecting a healthy host.

Question 11

Which of the following equations best represents the microbial conversion of glucose to ethanol and carbon dioxide during fermentation?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} \rightarrow 2\mathrm{CO_2$} + 2\mathrm{C_2H_5OH}$$

Question 12

Which of the following is a major factor contributing to the emergence of new infectious diseases?

Accepted Answer

Evolutionary changes such as antibiotic resistance

Question 13

A biofilm is most likely to cause problems in which of the following scenarios?

Accepted Answer

Clogging water pipes and causing infections on medical implants

Question 14

Which of the following statements about normal microbiota is FALSE?

Accepted Answer

Normal microbiota are acquired only after birth.

Question 15

Which of the following is an example of bioremediation?

Accepted Answer

Using bacteria to degrade oil spills in the ocean

Question 16

Which of the following is TRUE regarding Bacillus thuringiensis?

Accepted Answer

It produces protein crystals toxic to insects but harmless to animals and plants.

Question 17

Which of the following best describes the process of recombinant DNA technology?

Accepted Answer

Combining DNA from two different sources to produce proteins such as insulin in bacteria.

Question 18

Which of the following diseases is caused by a virus transmitted by the bite of an infected Aedes mosquito and can result in severe birth defects if contracted during pregnancy?

Accepted Answer

Zika virus disease

Question 19

Which of the following statements about the microbiome is TRUE?

Accepted Answer

The microbiome helps maintain good health and can train the immune system to discriminate threats.

Question 20

Which of the following is a correct example of a scientific name according to Linnaeus’s system?

Accepted Answer

Escherichia coli

The Microbial World and You: Foundations of Microbiology

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