Question 1

Which of the following statements best explains why viruses are not considered living organisms according to the major characteristics of life?

Accepted Answer

Viruses are not composed of cells.

Question 2

Which group of microorganisms includes both prokaryotic and eukaryotic members?

Accepted Answer

Protists

Question 3

A scientist is trying to classify a newly discovered microorganism. It is unicellular, lacks a nucleus, and its cell wall contains peptidoglycan. To which domain does this organism most likely belong?

Accepted Answer

Bacteria

Question 4

Which of the following is a unique feature of Gram-negative bacteria compared to Gram-positive bacteria?

Accepted Answer

Presence of an outer membrane containing lipopolysaccharides

Question 5

Horizontal gene transfer (HGT) in prokaryotes can complicate the reconstruction of evolutionary relationships. Which process is NOT a mechanism of HGT?

Accepted Answer

Binary fission

Question 6

Which nutritional mode describes an organism that uses light as an energy source and inorganic carbon (CO$$_2) as $$its carbon source?

Accepted Answer

Photoautotroph

Question 7

Why are most prokaryotes not cultivable in laboratory conditions?

Accepted Answer

Their metabolic requirements are too diverse and often unknown.

Question 8

Which of the following best describes the function of peptidoglycan in bacterial cells?

Accepted Answer

It provides structural strength to the cell wall.

Question 9

A bacterium is found to survive extreme heat, dryness, and radiation. Which structure is most likely responsible for this resistance?

Accepted Answer

Endospore

Question 10

Which of the following statements about Archaea is correct?

Accepted Answer

They can survive in extreme environments such as high salinity and temperature.

Question 11

Which method is commonly used to assess microbial diversity in an environmental sample without the need for culturing?

Accepted Answer

16S rRNA gene sequencing

Question 12

Which of the following is a consequence of horizontal gene transfer in prokaryotes?

Accepted Answer

Phylogenetic trees may not accurately reflect evolutionary history.

Question 13

Which of the following is NOT a characteristic of all living organisms?

Accepted Answer

Presence of a nucleus

Question 14

Which of the following statements about viruses is FALSE?

Accepted Answer

Viruses synthesize their own ATP.

Question 15

A Gram-positive bacterium is treated with penicillin. What is the most likely effect?

Accepted Answer

Peptidoglycan synthesis is inhibited, weakening the cell wall.

Question 16

Which of the following best describes the evolutionary relationship between Eukaryotes and Archaea?

Accepted Answer

Eukaryotes are a branch within the Archaea domain.

Question 17

Which of the following is a real-world example of horizontal gene transfer affecting human health?

Accepted Answer

Bacterial acquisition of antibiotic resistance genes

Question 18

Which of the following is a correct pairing of energy and carbon source for a chemoheterotroph?

Accepted Answer

Energy from organic compounds, carbon from organic compounds

Question 19

Which structure in prokaryotes is primarily responsible for attachment to surfaces and horizontal gene transfer?

Accepted Answer

Fimbriae/pili

Question 20

A researcher is studying microbial diversity in soil. She finds over 10,000 different species. Which property of prokaryotes does this observation best illustrate?

Accepted Answer

Their vast diversity and adaptability

Microbial Diversity: Prokaryotes, Eukaryotes, and Viruses

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