Question 1

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

Accepted Answer

A pathogen always causes disease in humans, while an opportunistic pathogen causes disease only in weakened hosts.

Question 2

Louis Pasteur’s experiment with the S-necked flask provided evidence for which scientific theory?

Accepted Answer

Biogenesis

Question 3

Which of the following is NOT a step in the scientific method?

Accepted Answer

Accepting a theory without evidence

Question 4

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

Accepted Answer

Staphylococcus aureus

Question 5

Which scientist is credited with developing the first aseptic techniques in the hospital setting and recommending hand washing to prevent childbed fever?

Accepted Answer

Ignaz Semmelweis

Question 6

Which of the following best describes the endosymbiotic theory?

Accepted Answer

Eukaryotic cells evolved from the fusion of two prokaryotic cells, with one becoming an internal organelle.

Question 7

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

Accepted Answer

Causing disease in all hosts

Question 8

A woman takes antibiotics for a urinary tract infection and subsequently develops a vaginal yeast infection. This is an example of:

Accepted Answer

Disruption of normal microbiota allowing an opportunistic pathogen to cause disease

Question 9

Which of the following is a distinguishing feature of prokaryotic cells?

Accepted Answer

Lack of membrane-bound organelles

Question 10

Which of the following best describes a biofilm?

Accepted Answer

A sticky community of one or more microbial species attached to a surface

Question 11

Which of the following is an example of mutualism?

Accepted Answer

Algae living inside coral tissue and providing food via photosynthesis

Question 12

Which of the following is a prion disease?

Accepted Answer

Creutzfeldt-Jakob disease

Question 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

Using bacteria to degrade petroleum oil spills into $$CO_2$$

Question 15

Which of the following statements about viruses is TRUE?

Accepted Answer

Viruses are nonliving entities that require a host cell to replicate.

Question 16

Which of the following is an example of a host–microbe interaction that influenced human evolution?

Accepted Answer

The sickle cell gene providing resistance to malaria in certain populations

Question 17

Which of the following is a plausible reason why some people do not get the flu or COVID-19 even when exposed?

Accepted Answer

They have higher levels of resistance due to factors such as age, health status, or genetics.

Question 18

Which of the following is a distinguishing feature of eukaryotic cells compared to prokaryotic cells?

Accepted Answer

Presence of a nucleus and membrane-bound organelles

Question 19

Which of the following is a real-life application of microbes in industry?

Accepted Answer

Production of ethyl alcohol and acetone

Question 20

Which of the following best describes the role of Koch’s postulates in microbiology?

Accepted Answer

They provide a systematic method to determine the specific causative agent of an infectious disease.

Introduction to Microbiology: History, Classification, and Microbe-Host Interactions

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