Question 1

Which of the following statements best describes the role of microbes in the nitrogen cycle?

Accepted Answer

Microbes convert nitrogen gas ($$N_2) $$from the atmosphere into organic compounds usable by plants.

Question 2

Which of the following is a correct example of scientific nomenclature for a bacterium?

Accepted Answer

Escherichia coli

Question 3

Which of the following characteristics distinguishes Archaea from Bacteria?

Accepted Answer

Archaea often live in extreme environments and lack peptidoglycan in their cell walls.

Question 4

Which of the following best describes the process of pasteurization?

Accepted Answer

Applying a high heat for a short time to kill harmful bacteria without evaporating the beverage.

Question 5

Which of the following is NOT a function of normal microbiota in the human body?

Accepted Answer

Causing disease in healthy individuals under all circumstances.

Question 6

Which of the following statements about biofilms is correct?

Accepted Answer

Biofilms can protect mucous membranes from harmful organisms and provide food in aquatic ecosystems.

Question 7

Which scientist is credited with disproving the theory of spontaneous generation using a swan-neck flask experiment?

Accepted Answer

Louis Pasteur

Question 8

Which of the following is an example of a eukaryotic microorganism?

Accepted Answer

Fungi

Question 9

Which of the following best describes the Germ Theory of Disease?

Accepted Answer

Diseases are caused by specific microorganisms invading the body.

Question 10

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 11

Which of the following is a real-world application of bioremediation?

Accepted Answer

Using bacteria to degrade oil spills in the ocean.

Question 12

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus surrounded by a nuclear membrane, while prokaryotic cells lack a nucleus.

Question 13

Which of the following is an example of an emerging infectious disease and a factor contributing to its emergence?

Accepted Answer

COVID-19; rapid global transportation

Question 14

Which of the following statements about viruses is correct?

Accepted Answer

Viruses are acellular and require a host cell to reproduce.

Question 15

Which of the following is a correct application of recombinant DNA technology?

Accepted Answer

Using bacteria to produce human insulin by inserting the human insulin gene into bacterial DNA.

Question 16

Which of the following best describes the function of Bacillus thuringiensis in agriculture?

Accepted Answer

It produces protein crystals toxic to insects, providing an alternative to chemical pesticides.

Question 17

Which of the following is a plausible reason why bacteria in biofilms are often resistant to antibiotics?

Accepted Answer

Biofilms provide a physical barrier that limits antibiotic penetration.

Question 18

Which of the following is an example of a multicellular animal parasite studied in microbiology?

Accepted Answer

Helminths (parasitic flatworms and roundworms)

Question 19

Which of the following discoveries is correctly matched with the scientist responsible?

Accepted Answer

Discovery of penicillin – Alexander Fleming

Question 20

Which of the following best describes the concept of microbial resistance?

Accepted Answer

The ability of microbes to survive and grow in the presence of antimicrobial drugs.

Introduction to Microbiology: The Microbial World and You

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