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 structural and functional adaptations, such as specialized cell walls and endospores, that enable survival in extreme conditions.

Question 2

A bacterium is observed to have a thick peptidoglycan layer and retains the crystal violet dye during Gram staining. Which type of bacterium is this, and what is the significance of this structure?

Accepted Answer

Gram-positive; the thick peptidoglycan layer provides structural support and protection.

Question 3

Which structure allows prokaryotes to exchange genetic material during conjugation, and what is the genetic element often transferred?

Accepted Answer

Pilus; F plasmid

Question 4

A scientist discovers a prokaryote living in a highly saline environment. Which domain is this organism most likely to belong to, and what adaptation might it possess?

Accepted Answer

Domain Archaea; unique membrane lipids and proteins for salt tolerance

Question 5

Which of the following best describes the process of transduction in prokaryotes?

Accepted Answer

A virus transfers genetic material from one bacterium to another.

Question 6

Which metabolic strategy is used by cyanobacteria, and what is the overall chemical equation for their energy acquisition?

Accepted Answer

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

Question 7

Which of the following is a key difference between the cell walls of Bacteria and Archaea?

Accepted Answer

Bacterial cell walls contain peptidoglycan, while archaeal cell walls contain polysaccharides and proteins.

Question 8

A soil bacterium is found to fix atmospheric nitrogen into ammonia. Which process is this, and why is it ecologically important?

Accepted Answer

Nitrogen fixation; it makes nitrogen available to plants in a usable form.

Question 9

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

Accepted Answer

They reproduce rapidly by binary fission, allowing mutations to accumulate quickly.

Question 10

Which group of bacteria is responsible for causing diseases such as syphilis and Lyme disease, and what is their characteristic shape?

Accepted Answer

Spirochetes; spiral-shaped

Question 11

A patient is infected with a bacterium that survives antibiotic treatment by forming a dormant, resistant structure. What is this structure called, and what is its main function?

Accepted Answer

Endospore; survival in harsh conditions

Question 12

Which of the following best describes the nutritional mode of a bacterium that uses inorganic chemicals as an energy source and $$CO_2 as a $$carbon source?

Accepted Answer

Chemoautotroph

Question 13

Which of the following is NOT a mechanism of genetic recombination in prokaryotes?

Accepted Answer

Binary fission

Question 14

Which domain includes organisms that are often extremophiles, such as those living in hot springs or highly saline environments?

Accepted Answer

Archaea

Question 15

Which of the following best describes the evolutionary relationship among Bacteria, Archaea, and Eukarya?

Accepted Answer

Archaea and Eukarya are more closely related to each other than either is to Bacteria.

Question 16

Which of the following is a real-world example of horizontal gene transfer in bacteria, and what is its significance?

Accepted Answer

Conjugation; spreads antibiotic resistance genes

Question 17

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

Accepted Answer

Attachment to surfaces and host cells

Question 18

A bacterium is classified as a facultative anaerobe. Which of the following best describes its metabolic capabilities?

Accepted Answer

It can survive with or without oxygen, switching metabolic pathways as needed.

Question 19

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

Accepted Answer

Gram-negative bacteria have an outer membrane containing lipopolysaccharides.

Question 20

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

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer that is targeted by the antibiotic.

Bacteria and Archaea: Structure, Function, and Diversity

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