Question 1

Which of the following statements best describes the role of normal microbiota in human health?

Accepted Answer

Normal microbiota help maintain good health by preventing the growth of pathogenic microbes.

Question 2

Which process is responsible for the conversion of nitrogen gas ($$N_2) $$from the air into organic compounds usable by plants?

Accepted Answer

Nitrogen fixation

Question 3

A scientist discovers a unicellular organism with peptidoglycan in its cell wall that divides by binary fission. Which domain does this organism most likely belong to?

Accepted Answer

Bacteria

Question 4

Which of the following is NOT a characteristic of Archaea?

Accepted Answer

Known to cause human diseases

Question 5

Which historical experiment disproved the theory of spontaneous generation by demonstrating that microorganisms originate from the air or fluids, not mystical forces?

Accepted Answer

Pasteur's S-shaped flask experiment

Question 6

Which of the following is an example of biotechnology that uses recombinant DNA technology?

Accepted Answer

Production of insulin by genetically modified bacteria

Question 7

A patient develops an infection on a medical implant that is resistant to antibiotics. Which microbial structure is most likely responsible for this resistance?

Accepted Answer

Biofilm

Question 8

Which of the following best defines the term 'microbiome'?

Accepted Answer

A group of microbes that live stably on or in the human body

Question 9

Which scientist is credited with developing the system of scientific nomenclature that uses two names: genus and specific epithet?

Accepted Answer

Carl Linnaeus

Question 10

Which of the following is a beneficial activity of microbes in the environment?

Accepted Answer

Decomposing organic waste

Question 11

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

Accepted Answer

$$Escherichia~coli$$

Question 12

Which of the following is NOT a domain in the classification of life developed by Carl Woese?

Accepted Answer

Protista

Question 13

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

Accepted Answer

Using bacteria to degrade oil spills in the ocean

Question 14

Which of the following factors contributes to the emergence of antibiotic-resistant infectious diseases?

Accepted Answer

Evolutionary changes in microbes

Question 15

Which of the following is a correct description of fermentation?

Accepted Answer

Microbial conversion of sugars to alcohol in the absence of air

Question 16

Which scientist discovered the first antibiotic, penicillin, and what organism produced it?

Accepted Answer

Alexander Fleming; Penicillium fungus

Question 17

Which of the following is a distinguishing feature of viruses compared to other microorganisms?

Accepted Answer

They can only replicate inside a living host cell

Question 18

Which of the following is an example of an emerging infectious disease (EID)?

Accepted Answer

COVID-19 caused by SARS-CoV-2

Question 19

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

Accepted Answer

Demonstrating that a specific microbe causes a specific disease

Question 20

Which of the following is a plausible consequence of disrupting the normal microbiota in the human gut?

Accepted Answer

Overgrowth of pathogenic microbes leading to disease

Microbiology: An Introduction – The Microbial World and You

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