Q: Which of the following equations best represents the timeline of prokaryotic evolution?

$$3.5 \times 10^9$ years ago: Prokaryotes evolved

Question 1

Which of the following statements best describes the difference between bacteria and archaea?

Accepted Answer

Both are prokaryotic, but bacteria can be pathogenic or nonpathogenic, while archaea are nonpathogenic and often live in extreme environments.

Question 2

A patient receives a corneal transplant and later develops a rare neurodegenerative disease. Which type of microbe is most likely responsible, and why?

Accepted Answer

A prion, because prions are infectious proteins that can be transmitted by transplant and cause neurodegenerative diseases.

Question 3

Which of the following is NOT a characteristic of viruses?

Accepted Answer

They are always visible under a light microscope without staining.

Question 4

According to the endosymbiotic theory, which of the following statements is correct?

Accepted Answer

Eukaryotic cells evolved from the fusion of two prokaryotic cells, one of which became an organelle.

Question 5

Which of the following best explains why less than 1% of all microbes are pathogenic to humans?

Accepted Answer

Most microbes are adapted to environments that are inhospitable to humans.

Question 6

A scientist discovers a unicellular organism living in a hot spring with no known pathogenicity. Which group does this organism most likely belong to?

Accepted Answer

Archaea

Question 7

Which of the following is a correct pairing of microbe and its cell type?

Accepted Answer

Fungi – Eukaryotic

Question 8

A hospital patient with a weakened immune system develops pneumonia from a microbe that is normally harmless in healthy individuals. This microbe is best described as:

Accepted Answer

An opportunistic pathogen

Question 9

Which of the following best illustrates the importance of microbes in environmental science?

Accepted Answer

Microbes are used to break down environmental hazards such as oil spills.

Question 10

Which of the following statements about prions is TRUE?

Accepted Answer

Prions are nonliving infectious proteins that can be inherited or transmitted by ingestion.

Question 11

A researcher is studying a microbe that is multicellular, eukaryotic, and parasitic. Which group does this microbe most likely belong to?

Accepted Answer

Helminths

Question 12

Which of the following is a real-world example of how humans rely on microbes?

Accepted Answer

Using yeast to ferment bread and produce alcohol.

Question 13

Which of the following equations best represents the timeline of prokaryotic evolution?

Accepted Answer

$$3.5 	imes 10^9$ years ago: Prokaryotes evolved

Question 14

Which of the following is NOT a field in which microbiology plays a significant role?

Accepted Answer

Astrology

Question 15

A microbe is described as eukaryotic, unicellular, and sometimes pathogenic. Which group does it most likely belong to?

Accepted Answer

Protists

Question 16

Which of the following best explains why some fungi and helminths are considered microbes even though they are not always microscopic?

Accepted Answer

Part of their life cycle is microscopic.

Question 17

A virus infects a bacterial cell. What is the term for this type of virus?

Accepted Answer

Bacteriophage

Question 18

Which of the following is a correct statement about the diversity of microbial life on Earth?

Accepted Answer

At least half of Earth's life is microbial.

Question 19

A new microbe is discovered that is noncellular, contains RNA as its genetic material, and can infect plant cells. Which group does it belong to?

Accepted Answer

Virus

Question 20

Which of the following best describes an opportunistic pathogen?

Accepted Answer

A microbe that causes disease only in a weakened host.

Introduction to Microbiology: Microbes and Their Diversity

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