Question 1

Which of the following statements best explains why prokaryotes are considered more diverse in their nutritional modes than eukaryotes?

Accepted Answer

Prokaryotes can utilize both organic and inorganic compounds as energy and carbon sources, allowing them to inhabit a wide range of environments.

Question 2

A scientist isolates a microorganism from a hot spring with a temperature of 90°C and high salt concentration. Which domain is this organism most likely to belong to?

Accepted Answer

Archaea

Question 3

Which structure allows certain bacteria to attach to surfaces and evade the host immune system?

Accepted Answer

Capsule

Question 4

Gram-positive bacteria differ from Gram-negative bacteria in that Gram-positive bacteria:

Accepted Answer

Have a thick layer of peptidoglycan and lack an outer membrane.

Question 5

Which of the following best describes the role of biofilms in medical and environmental contexts?

Accepted Answer

Biofilms are communities of microbes that are difficult to remove and can cause persistent infections or clog pipes.

Question 6

A bacterium that obtains energy from sunlight and carbon from organic compounds is classified as a:

Accepted Answer

Photoheterotroph

Question 7

Which of the following is a correct equation for the process by which cyanobacteria generate oxygen?

Accepted Answer

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

Question 8

Which group of bacteria is responsible for nitrogen fixation in the root nodules of legumes?

Accepted Answer

Proteobacteria

Question 9

A patient is diagnosed with a urinary tract infection caused by an intracellular bacterium. Which group is most likely responsible?

Accepted Answer

Chlamydias

Question 10

Which of the following statements about endospores is correct?

Accepted Answer

Endospores are dormant structures that enable bacteria to survive harsh conditions.

Question 11

Which of the following is a distinguishing feature of Archaea compared to Bacteria?

Accepted Answer

Ability to thrive in extreme environments such as high temperature or salinity

Question 12

Which of the following best describes the function of fimbriae in bacteria?

Accepted Answer

Attachment to surfaces and host cells

Question 13

A sewage treatment plant uses a trickling filter system to treat liquid waste. What is the primary role of prokaryotes in this system?

Accepted Answer

To remove organic material from waste by forming biofilms on rocks

Question 14

Which of the following is true regarding the evolutionary relationship between Archaea, Bacteria, and Eukarya?

Accepted Answer

Bacteria and Archaea diverged first, with Eukarya splitting from Archaea later.

Question 15

Which of the following is an example of bioremediation?

Accepted Answer

Using bacteria to clean up oil spills in the ocean

Question 16

Which of the following best describes an exotoxin?

Accepted Answer

A protein secreted by bacteria that can cause disease symptoms even in the absence of the bacteria

Question 17

Which of the following equations represents the process of nitrogen fixation by certain prokaryotes?

Accepted Answer

$$N_2 + 8H^+ + 8e$$^- \rightarrow 2NH_3 + $$H_2$$

Question 18

Which group of bacteria is known for its helical shape and includes the causative agents of syphilis and Lyme disease?

Accepted Answer

Spirochetes

Question 19

Which of the following is a characteristic unique to eukaryotes when compared to bacteria and archaea?

Accepted Answer

Presence of a nucleus and membrane-bound organelles

Question 20

Which of the following best explains why prokaryotic populations can adapt rapidly to environmental changes?

Accepted Answer

Rapid population growth and frequent mutations increase genetic variation.

Microbial Life: Prokaryotes and Their Diversity

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