Question 1

Which of the following statements best describes the difference between Bacteria and Archaea cell walls?

Accepted Answer

Bacteria cell walls contain peptidoglycan, while Archaea cell walls contain glycoproteins.

Question 2

Which group of organisms is most likely to be found living in extreme environments such as hydrothermal vents or under Arctic ice?

Accepted Answer

Archaea

Question 3

What is the primary function of endospores in bacteria?

Accepted Answer

To allow bacteria to survive in stressful conditions such as dehydration or nutrient deprivation.

Question 4

Which process is responsible for converting atmospheric nitrogen ($$N_2) $$into a form usable by living organisms?

Accepted Answer

Nitrogen fixation

Question 5

A scientist discovers a microbe that thrives in water saltier than seawater and can survive high temperatures. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 6

Which of the following best explains why oxygenic photosynthesis was a major evolutionary event?

Accepted Answer

It increased atmospheric oxygen, enabling aerobic respiration and more efficient energy production.

Question 7

Which of the following is NOT a characteristic of prokaryotic cells?

Accepted Answer

Presence of a membrane-bound nucleus

Question 8

A bacterial cell is observed to stain purple in a Gram stain test. What does this indicate about its cell wall?

Accepted Answer

It has a thick layer of peptidoglycan.

Question 9

Which of the following equations correctly represents the process of oxygenic photosynthesis?

Accepted Answer

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

Question 10

Which of the following is a real-world consequence of excessive use of $$NH_3$$ fertilizers in agriculture?

Accepted Answer

Creation of anaerobic 'dead zones' in aquatic ecosystems due to increased nitrate runoff.

Question 11

Which structure is found in prokaryotic cells and is responsible for movement?

Accepted Answer

Flagella

Question 12

Which of the following best describes a biofilm?

Accepted Answer

A colony of bacteria enmeshed in a polysaccharide-rich matrix that shields them from antibiotics.

Question 13

Which metabolic strategy is used by organisms that oxidize inorganic molecules with high potential energy to obtain energy?

Accepted Answer

Chemolithotrophy

Question 14

Why are bacteria and archaea critical for bioremediation of polluted environments?

Accepted Answer

They can degrade toxins and accumulate pollutants, making them useful for cleaning contaminated sites.

Question 15

Which of the following is a correct statement about the evolutionary history of prokaryotes and eukaryotes?

Accepted Answer

Prokaryotes appeared before eukaryotes in Earth's history.

Question 16

A patient is infected with a bacterial strain that is resistant to multiple antibiotics. Which of the following is a likely cause of this resistance?

Accepted Answer

Overuse of antibiotics in animal feed leading to evolution of resistant strains.

Question 17

Which of the following best describes the role of the human microbiome?

Accepted Answer

It consists of populations of microbes that naturally inhabit the human body and help maintain health.

Question 18

Which of the following structures is NOT found in prokaryotic cells?

Accepted Answer

Mitochondria

Question 19

Which of the following is a plausible explanation for the ubiquity and abundance of bacteria and archaea on Earth?

Accepted Answer

They can survive and thrive in a wide range of environments, including extreme habitats.

Question 20

Which of the following best describes the Gram-negative bacterial cell wall?

Accepted Answer

It has a thin layer of peptidoglycan and an outer lipid bilayer.

Prokaryotes and the Tree of Life: Structure, Diversity, and Ecological Roles

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