Question 1

Which of the following statements best explains why Archaea are classified separately from Bacteria?

Accepted Answer

Archaea lack peptidoglycan in their cell walls and often live in extreme environments.

Question 2

Which of the following is NOT a function performed by microbes in the environment?

Accepted Answer

Formation of multicellular animal tissues

Question 3

A scientist isolates a unicellular organism with a cell wall containing chitin, linear DNA, and the ability to reproduce both sexually and asexually. This organism is most likely a:

Accepted Answer

Fungus

Question 4

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

Accepted Answer

Diseases are caused by specific microorganisms invading the body.

Question 5

Which scientist is credited with disproving spontaneous generation through the use of S-shaped flasks?

Accepted Answer

Louis Pasteur

Question 6

Which of the following is a correct example of scientific nomenclature according to Linnaeus’ system?

Accepted Answer

$$	extit{Escherichia coli}$$

Question 7

Which of the following is a unique feature of viruses compared to other microorganisms?

Accepted Answer

They are obligate intracellular parasites and lack cellular structure.

Question 8

Which of the following best describes the process of pasteurization?

Accepted Answer

Applying a high heat for a short time to kill harmful bacteria in beverages.

Question 9

A patient is infected with a microbe that lacks a nucleus, has a cell wall with peptidoglycan, and reproduces by binary fission. This microbe is most likely a:

Accepted Answer

Bacterium

Question 10

Which of the following is a correct sequence of taxonomic ranks from most general to most specific?

Accepted Answer

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

Question 11

Which of the following discoveries most directly enabled the development of genetic engineering and recombinant DNA technology?

Accepted Answer

Discovery of restriction enzymes

Question 12

Which of the following statements about the Human Microbiome Project (HMP) is correct?

Accepted Answer

The metabolic capabilities of bacterial communities are remarkably similar among people.

Question 13

Which of the following is an example of bioremediation?

Accepted Answer

Using bacteria to clean up oil spills in the ocean

Question 14

Which of the following best describes the role of small RNAs in cells, as revealed by genome sequencing?

Accepted Answer

They play critical roles in regulating cellular processes.

Question 15

Which of the following is a correct application of Koch’s postulates?

Accepted Answer

Demonstrating that a specific bacterium causes a specific disease by isolating it from a diseased animal and infecting a healthy animal.

Question 16

Which of the following is a distinguishing feature of protozoa?

Accepted Answer

They are eukaryotic and may be motile via pseudopods, cilia, or flagella.

Question 17

Which of the following best describes the CRISPR-Cas9 system in prokaryotes?

Accepted Answer

A genome editing technique that provides acquired immunity by detecting and destroying foreign DNA.

Question 18

Which of the following is a real-world example of the application of the polymerase chain reaction (PCR)?

Accepted Answer

Amplifying DNA from a crime scene for forensic analysis.

Question 19

Which of the following is a correct statement about the evolutionary timeline of life on Earth?

Accepted Answer

Single-celled organisms appeared about 4 billion years ago.

Question 20

Which of the following is a plausible reason why not all bacteria are harmful to humans?

Accepted Answer

The vast majority of microorganisms that associate with humans are harmless or beneficial.

Chapter 1: The Microbial World and You – Foundations of Microbiology

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