Question 1

Which of the following statements best describes the impact of microorganisms on the human body, based on current estimates?

Accepted Answer

Bacterial cells in the human body outnumber human cells by approximately 10:1 if red blood cells are excluded.

Question 2

Which of the following is a major reason why the death rate from infectious diseases in the United States declined dramatically during the 20th century?

Accepted Answer

The introduction of public health measures such as chlorination of water and immunizations.

Question 3

Which of the following emerging infectious diseases had a mortality rate of approximately 50% during its initial outbreak in the Four Corners region of the United States in 1993?

Accepted Answer

Hantavirus

Question 4

Which of the following best explains why the total amount of nitrogen and phosphorus in prokaryotes exceeds that in all plant biomass on Earth?

Accepted Answer

Prokaryotes are extremely abundant and are found in diverse environments, including oceanic and terrestrial subsurfaces.

Question 5

Which of the following is a defining characteristic of Archaea that distinguishes them from Bacteria?

Accepted Answer

Archaea have membranes made with isoprenoid fatty acids and can have monolayers.

Question 6

Which of the following best describes the classification of microorganisms according to Woese’s three-domain system?

Accepted Answer

Microorganisms are classified based on 16S ribosomal RNA sequences.

Question 7

Which of the following is NOT a eukaryotic microorganism?

Accepted Answer

Bacteria

Question 8

A patient presents with ringworm, a fungal infection. Which of the following characteristics is most likely associated with the causative organism?

Accepted Answer

It is a eukaryote with cell walls composed of chitin.

Question 9

Which of the following protozoa is correctly matched with its mechanism of motility?

Accepted Answer

Paramecium – cilia

Question 10

Which of the following best explains why algae are generally not considered pathogenic to humans?

Accepted Answer

Algae are primarily photosynthetic and do not infect humans, though some can cause harm through toxins in red tides.

Question 11

Which of the following helminths is classified as a nematode?

Accepted Answer

Ascaris (roundworm)

Question 12

Which of the following statements about viruses is correct?

Accepted Answer

Viruses are acellular and require a host cell for replication.

Question 13

Which of the following diseases is caused by a non-motile protozoan?

Accepted Answer

Malaria

Question 14

Which of the following best describes the role of fungi in the environment?

Accepted Answer

Fungi are decomposers that mineralize organic matter.

Question 15

Which of the following is a plausible consequence if all microorganisms ceased to exist?

Accepted Answer

Decomposition of organic matter would halt, leading to nutrient depletion.

Question 16

Which of the following best explains the increase in emerging infectious diseases in recent decades?

Accepted Answer

Factors such as microbial evolution, increased travel, and changes in land use contribute to the rise of emerging diseases.

Question 17

Which of the following is the correct order of increasing complexity among microorganisms?

Accepted Answer

Viruses, bacteria, protozoa, fungi

Question 18

Which of the following statements about the global burden of infectious diseases is supported by the data?

Accepted Answer

Tuberculosis, HIV/AIDS, and malaria are among the leading causes of death from communicable diseases.

Question 19

Which of the following is a correct statement about the classification of fungi?

Accepted Answer

Fungi are classified by the type of sexual spore they produce.

Question 20

Which of the following best describes the historical impact of cholera on 19th-century migration in North America?

Accepted Answer

Cholera caused significant mortality among migrants, with some groups experiencing death rates as high as 40%.

Introduction to Microbiology: Microorganisms, Infectious Diseases, and Classification

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