Question 1

Which of the following best describes the difference between a pathogen and an opportunistic pathogen?

Accepted Answer

Pathogens are microbes that always cause disease in humans, while opportunistic pathogens cause disease only in a weakened host.

Question 2

Which scientist disproved the theory of spontaneous generation by demonstrating that maggots do not arise from meat unless flies can access it?

Accepted Answer

Francesco Redi

Question 3

What is the main goal of aseptic technique in healthcare and laboratory settings?

Accepted Answer

To prevent healthcare-acquired infections and limit the spread of disease.

Question 4

Which of the following is NOT a step in Koch’s postulates of disease?

Accepted Answer

The organism must be present in healthy hosts as well as diseased hosts.

Question 5

Which of the following statements about the scientific method is correct?

Accepted Answer

A theory is a hypothesis that has been proven through many studies with consistent, supporting conclusions.

Question 6

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

Accepted Answer

Escherichia coli

Question 7

Which of the following best describes mutualism in host-microbe interactions?

Accepted Answer

Both the microbe and the host benefit from the relationship.

Question 8

Why are biofilms particularly problematic in healthcare settings?

Accepted Answer

Biofilms are more resistant to antibiotics and protected from the immune system.

Question 9

Which of the following is a real-world example of how microbes impact the environment?

Accepted Answer

Microbes can degrade petroleum oil spills into $CO_2$.

Question 10

Which of the following statements about normal microbiota is TRUE?

Accepted Answer

Normal microbiota can include pathogens that are harmless in certain locations.

Question 11

A woman takes antibiotics for a urinary tract infection and subsequently develops a vaginal yeast infection. What is the most likely explanation?

Accepted Answer

Antibiotics disrupted the normal vaginal microbiota, allowing opportunistic Candida albicans to overgrow.

Question 12

Which of the following is a correct statement about prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells include all multicellular organisms and some unicellular microorganisms.

Question 13

Which scientist is credited with developing the first vaccine against anthrax and rabies?

Accepted Answer

Louis Pasteur

Question 14

Which of the following is NOT a type of microbe studied in microbiology?

Accepted Answer

Plants

Question 15

Which of the following is a correct sequence in the taxonomic hierarchy from broadest to most specific?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 16

Which of the following contributed to the development of aseptic techniques in healthcare?

Accepted Answer

Ignaz Semmelweis, Joseph Lister, and Florence Nightingale

Question 17

Which of the following is a plausible reason why only about 2% of bacteria can be cultured in the laboratory?

Accepted Answer

Many bacteria require complex growth environments not easily replicated in the lab.

Question 18

Which of the following is an example of a symbiotic relationship that influenced human evolution?

Accepted Answer

The relationship between humans and malaria-causing protozoa, where sickle cell gene carriers have a survival advantage.

Question 19

Which of the following is NOT a function of the normal microbiota?

Accepted Answer

Causing disease in all hosts.

Introduction to Microbiology: Key Concepts and Historical Foundations

Study Guide - Practice Questions