Question 1

Which of the following statements best explains why prokaryotes are able to thrive in extreme environments such as hot springs and salt lakes?

Accepted Answer

They have diverse structural and metabolic adaptations, such as endospore formation and unique cell wall compositions.

Question 2

A bacterium is observed to survive boiling temperatures and later resume growth when conditions improve. Which structure is most likely responsible for this survival?

Accepted Answer

Endospore

Question 3

Which of the following best describes the difference between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer that retains crystal violet dye, while Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.

Question 4

Which process involves the uptake of naked DNA fragments from the environment by a prokaryotic cell?

Accepted Answer

Transformation

Question 5

A scientist discovers a prokaryote living in a highly saline environment. Which group is this organism most likely to belong to?

Accepted Answer

Extreme halophiles

Question 6

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

Accepted Answer

Presence of a nucleus

Question 7

Which metabolic strategy is used by cyanobacteria?

Accepted Answer

Photoautotrophy

Question 8

A patient is diagnosed with a bacterial infection caused by Treponema pallidum. Which group does this bacterium belong to?

Accepted Answer

Spirochetes

Question 9

Which of the following best describes the function of the F plasmid in bacterial conjugation?

Accepted Answer

It allows the transfer of genetic material from a donor to a recipient cell via a pilus.

Question 10

Which equation best represents the process of nitrogen fixation carried out by certain prokaryotes?

Accepted Answer

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

Question 11

Which of the following is a real-world consequence of horizontal gene transfer among bacteria?

Accepted Answer

Rapid spread of antibiotic resistance genes in hospitals

Question 12

Which structure allows prokaryotes to adhere to surfaces and each other, playing a key role in biofilm formation?

Accepted Answer

Fimbriae

Question 13

Which of the following best explains why prokaryotes can evolve rapidly?

Accepted Answer

They have short generation times and accumulate mutations quickly during binary fission.

Question 14

Which of the following is true about the evolutionary relationships among Bacteria, Archaea, and Eukarya?

Accepted Answer

Eukarya and Archaea share a more recent common ancestor with each other than with Bacteria.

Question 15

Which of the following scenarios best illustrates the process of transduction in bacteria?

Accepted Answer

A bacteriophage transfers DNA from one bacterium to another.

Question 16

Which of the following best describes the nutritional mode of a bacterium that uses light for energy and organic compounds as a carbon source?

Accepted Answer

Photoheterotroph

Question 17

Which of the following is a medically significant Gram-positive bacterium known for producing antibiotics?

Accepted Answer

Streptomyces

Question 18

Which of the following is a correct statement about the origin of chloroplasts in eukaryotic cells?

Accepted Answer

They evolved from cyanobacteria through endosymbiosis.

Question 19

A bacterium is classified as an obligate anaerobe. Which of the following best describes its metabolism?

Accepted Answer

It is poisoned by oxygen and uses fermentation or anaerobic respiration.

Question 20

Which of the following best explains why antibiotics such as penicillin are more effective against Gram-positive bacteria than Gram-negative bacteria?

Accepted Answer

Gram-negative bacteria have an outer membrane that protects them from antibiotics.

Bacteria and Archaea: Structure, Function, and Diversity

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