Question 1

Which of the following best defines microbiology?

Accepted Answer

The study of organisms too small to be seen with the naked eye, including bacteria, archaea, fungi, protists, helminths, viruses, and prions.

Question 2

Which of the following is NOT considered a living microorganism?

Accepted Answer

Viruses

Question 3

A scientist isolates a microbe from a hot spring that is unicellular, prokaryotic, and thrives in extreme environments. Which group does this microbe most likely belong to?

Accepted Answer

Archaea

Question 4

Which of the following is an example of a real-world application of microbes?

Accepted Answer

Bioremediation of oil spills by converting hydrocarbons to $$CO_2$$

Question 5

Which statement about the binomial nomenclature system is correct?

Accepted Answer

The genus name is capitalized and the species name is lowercase, both italicized.

Question 6

A strain of bacteria is best described as:

Accepted Answer

A genetic variant of a species, distinguished by specific genes that alter its behavior.

Question 7

Which of the following best describes the difference between a scientific law and a scientific theory?

Accepted Answer

A law predicts what happens, while a theory explains how and why something happens.

Question 8

Which of the following is an example of an observation rather than a conclusion?

Accepted Answer

A patient’s temperature is measured at 39°C.

Question 9

Which of the following is a reason why biofilms are a concern in healthcare settings?

Accepted Answer

Biofilms are tolerant of antibiotic doses up to 1,000 times higher than those that kill planktonic bacteria.

Question 10

Which of the following best describes an opportunistic pathogen?

Accepted Answer

A microbe that causes disease only in a weakened or immunocompromised host.

Question 11

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

Accepted Answer

Causing disease in all hosts

Question 12

A patient develops a Clostridium difficile infection after antibiotic therapy. This is an example of:

Accepted Answer

Dysbiosis, where disruption of normal microbiota allows opportunistic pathogens to flourish.

Question 13

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

Accepted Answer

$$	extit{Escherichia coli}$$

Question 14

Which of the following is a eukaryotic microbe that can be unicellular or multicellular?

Accepted Answer

Fungi

Question 15

Which of the following best describes the human microbiome?

Accepted Answer

The collection of all microbes that live in or on the human body.

Question 16

Which of the following is a real-life example of a harmless microbe becoming pathogenic due to a change in location?

Accepted Answer

E. coli moving from the appendix to the abdominal cavity.

Question 17

Which of the following is NOT a habitat where microbes are commonly found?

Accepted Answer

Brain and spinal cord

Question 18

Which of the following best describes the process of bioremediation?

Accepted Answer

Using microbes to metabolize toxic substances into harmless intermediates.

Question 19

Which of the following is a correct sequence for the steps of the scientific method?

Accepted Answer

Observation → Question → Hypothesis → Experiment → Conclusion

Question 20

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

Accepted Answer

They lack a membrane-bound nucleus.

Chapter 1: Introduction to Microbiology – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards