Question 1

Which of the following best describes the main contribution of Louis Pasteur to microbiology?

Accepted Answer

He disproved the theory of spontaneous generation by demonstrating that microorganisms come from the air, not from food itself.

Question 2

Which of the following is NOT a positive contribution of microorganisms to life on Earth?

Accepted Answer

Causing major and minor infections in humans.

Question 3

Which hierarchical level is the most inclusive in the classification of living organisms?

Accepted Answer

Domain

Question 4

Which of the following statements about viruses is TRUE?

Accepted Answer

Viruses are not classified within the three domains of life.

Question 5

Which scientist is credited with the development of the first vaccine, and for which disease?

Accepted Answer

Edward Jenner, for smallpox

Question 6

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

Accepted Answer

Escherichia coli

Question 7

Which of the following is NOT a field of study within microbiology?

Accepted Answer

Botany

Question 8

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

Accepted Answer

Eukaryotic cells have their DNA enclosed in a nucleus, while prokaryotic cells do not.

Question 9

Which of the following is a commercial application of microorganisms?

Accepted Answer

Production of yogurt by bacterial fermentation.

Question 10

According to Koch’s postulates, which step is necessary to prove that a specific microorganism causes a disease?

Accepted Answer

The microorganism must be isolated from a diseased host and grown in pure culture.

Question 11

Which of the following best describes the Germ Theory of Disease?

Accepted Answer

Diseases are caused by microorganisms that invade the body.

Question 12

Which scientist is known for using carbolic acid (phenol) to disinfect surgical instruments and reduce infections?

Accepted Answer

Joseph Lister

Question 13

Which of the following is a correct sequence in the hierarchical system of classification from broadest 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 a virus being used in medical treatment?

Accepted Answer

Using measles virus to treat multiple myeloma.

Question 15

Which of the following is a plausible reason why prions are not classified as living organisms?

Accepted Answer

They lack nucleic acids and do not carry genetic information.

Question 16

Which of the following equations best represents the process of photosynthesis carried out by some microorganisms?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 17

Which of the following is a correct application of binomial nomenclature rules?

Accepted Answer

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

Question 18

Which of the following is a plausible reason why antibiotics are not effective against viral infections?

Accepted Answer

Viruses lack the cellular structures targeted by antibiotics.

Question 19

Which of the following best explains why Ignaz Semmelweis advocated handwashing in hospitals?

Accepted Answer

To prevent the spread of infectious agents from doctors to patients.

Question 20

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.

Introduction to Microbiology: History, Classification, and Key Concepts

Study Guide - Practice Questions