Question 1

Which of the following best describes the difference between normal microbiota and transient microbiota?

Accepted Answer

Normal microbiota are permanently present in a healthy individual, while transient microbiota are present for only a short period.

Question 2

Which experiment provided the strongest evidence against the theory of spontaneous generation?

Accepted Answer

Pasteur’s swan-neck flask experiment

Question 3

Which of the following is the correct format for writing the scientific name of the bacterium that causes strep throat?

Accepted Answer

$$Streptococcus\ pyogenes$$

Question 4

Which of the following statements about Archaea is TRUE?

Accepted Answer

Archaea often live in extreme environments such as high salt or high temperature.

Question 5

Which scientist is credited with the first observation of microorganisms, referred to as 'animalcules'?

Accepted Answer

Anton van Leeuwenhoek

Question 6

Which of the following best summarizes Koch’s postulates?

Accepted Answer

A set of criteria to determine if a specific microorganism causes a specific disease.

Question 7

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

Accepted Answer

Decomposing organic waste

Question 8

Which of the following is NOT a characteristic of viruses?

Accepted Answer

They contain both DNA and RNA in their core.

Question 9

Which of the following best explains why biofilms are medically significant?

Accepted Answer

Biofilms protect microbes from antibiotics and the immune system, making infections harder to treat.

Question 10

Which of the following is the correct sequence of events in Pasteur’s swan-neck flask experiment that disproved spontaneous generation?

Accepted Answer

Boil broth, use swan-neck flask to allow air but trap microbes, observe no growth.

Question 11

Which of the following best describes antibiotic resistance?

Accepted Answer

The ability of bacteria to survive and multiply in the presence of an antibiotic due to genetic changes.

Question 12

Which of the following is a correct example of binomial nomenclature?

Accepted Answer

$$Escherichia\ coli$$

Question 13

Which of the following is a reason why emerging infectious diseases (EIDs) are increasing?

Accepted Answer

Microbial adaptation and changes in human behavior

Question 14

Which of the following best describes the contribution of Ignaz Semmelweis to microbiology?

Accepted Answer

He introduced hand disinfection to reduce puerperal fever.

Question 15

Which of the following is a defining feature of fungi?

Accepted Answer

They have cell walls made of chitin.

Question 16

Which of the following is the best definition of the human microbiome?

Accepted Answer

The collection of all microorganisms living in and on the human body.

Question 17

Which of the following is a correct statement about the three domains of life?

Accepted Answer

Bacteria and Archaea are both prokaryotic, while Eukarya includes all eukaryotic organisms.

Question 18

Which of the following best describes the process of pasteurization?

Accepted Answer

Heating liquids just enough to kill most spoilage bacteria without damaging the product.

Question 19

Which of the following is a correct application of Koch’s postulates in a real-world scenario?

Accepted Answer

Isolating a suspected pathogen from a diseased animal, growing it in pure culture, and showing it causes the same disease in a healthy animal.

Question 20

Which of the following best explains why antibiotic-resistant bacteria become predominant in a population after antibiotic treatment?

Accepted Answer

Resistant bacteria survive and multiply, while susceptible bacteria are killed.

Introduction to Microbiology: The Microbial World and You

Study Guide - Practice Questions