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 air into organic compounds usable by plants.

Question 2

Which of the following is NOT a characteristic of Archaea?

Accepted Answer

They have peptidoglycan cell walls.

Question 3

Which scientist is credited with disproving the theory of spontaneous generation using S-shaped flasks?

Accepted Answer

Louis Pasteur

Question 4

Which of the following best explains why viruses are considered acellular?

Accepted Answer

They lack cellular structure and can only replicate inside a living host cell.

Question 5

Which of the following is an example of a beneficial biofilm?

Accepted Answer

Biofilms that protect mucous membranes from harmful organisms.

Question 6

Which of the following pairs is correctly matched regarding scientific nomenclature?

Accepted Answer

Staphylococcus aureus: clustered spherical cells with gold-colored colonies

Question 7

Which of the following statements about normal microbiota is FALSE?

Accepted Answer

Normal microbiota always cause disease in the host.

Question 8

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

Accepted Answer

Demonstrating that a specific bacterium causes anthrax.

Question 9

Which of the following best describes the process of pasteurization?

Accepted Answer

Application of high heat for a short time to kill harmful bacteria in beverages.

Question 10

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

Accepted Answer

Using bacteria to degrade oil spills in the ocean.

Question 11

Which of the following is a distinguishing feature of fungi compared to bacteria?

Accepted Answer

Fungi have chitin cell walls, while bacteria have peptidoglycan cell walls.

Question 12

Which of the following is NOT a factor contributing to the emergence of infectious diseases?

Accepted Answer

Decreased human exposure to infectious agents due to improved sanitation.

Question 13

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 14

Which of the following statements about viruses is TRUE?

Accepted Answer

Viruses are replicated only when they are in a living host cell.

Question 15

Which of the following is an example of a synthetic chemotherapeutic agent?

Accepted Answer

Sulfonamides

Question 16

Which of the following is a correct statement about the microbiome?

Accepted Answer

The microbiome helps maintain good health and may help train the immune system.

Question 17

Which of the following is a correct description of the process of fermentation?

Accepted Answer

Microbial conversion of sugar to alcohol in the absence of air.

Question 18

Which of the following is a correct match between a scientist and their contribution?

Accepted Answer

Joseph Lister: Used phenol to prevent surgical wound infections.

Question 19

Which of the following is a correct statement about antibiotic resistance?

Accepted Answer

Antibiotic resistance can result from evolutionary changes in microbes.

Question 20

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

Accepted Answer

Inserting a human gene into bacteria to produce insulin.

Chapter 1: The Microbial World and You – Study Notes

Study Guide - Practice Questions