Question 1

Which of the following characteristics most directly enables prokaryotes to rapidly adapt to new environments and reach large population sizes?

Accepted Answer

Rapid reproduction and high mutation rates

Question 2

A bacterium is observed to survive boiling temperatures for several hours. Which structure is most likely responsible for this survival?

Accepted Answer

Endospore

Question 3

Which of the following best explains why gram-negative bacteria are generally more resistant to antibiotics than gram-positive bacteria?

Accepted Answer

They have an outer membrane containing lipopolysaccharides

Question 4

A scientist discovers a unicellular organism with a cell wall containing peptidoglycan. Which domain does this organism most likely belong to?

Accepted Answer

Bacteria

Question 5

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

Accepted Answer

Transformation

Question 6

A patient is infected with a bacterium that is resistant to multiple antibiotics. Which genetic element is most likely responsible for this resistance?

Accepted Answer

R plasmid

Question 7

Which metabolic category describes an organism that uses light for energy and CO$$_2 as a $$carbon source?

Accepted Answer

Photoautotroph

Question 8

In the cyanobacterium Anabaena, what is the primary function of heterocysts?

Accepted Answer

Nitrogen fixation

Question 9

Which of the following statements about biofilms is FALSE?

Accepted Answer

Biofilms are uncommon in nature.

Question 10

Which group of prokaryotes is most likely to be found in hot springs with temperatures above 100$$^\circC$$?

Accepted Answer

Extreme thermophiles

Question 11

A researcher is studying a bacterium that can survive in the absence of oxygen by using nitrate as a terminal electron acceptor. This bacterium is best described as a(n):

Accepted Answer

Obligate anaerobe

Question 12

Which of the following is NOT a function of the bacterial capsule?

Accepted Answer

Production of ATP

Question 13

Which of the following best describes the role of prokaryotes in the nitrogen cycle?

Accepted Answer

They convert atmospheric N$$_2 to $$ammonia (NH$$_3) $$through nitrogen fixation.

Question 14

Which of the following is a real-world example of horizontal gene transfer increasing bacterial virulence?

Accepted Answer

A harmless E. coli strain acquires toxin genes from a pathogenic species via phage-mediated transfer.

Question 15

Which of the following statements about the CRISPR-Cas9 system is correct?

Accepted Answer

It is a bacterial defense mechanism against viral infection.

Question 16

Which of the following ecological interactions involves one organism benefiting while the other is neither helped nor harmed?

Accepted Answer

Commensalism

Question 17

A scientist is attempting to improve the PCR technique by studying the source of the DNA polymerase enzyme used in the reaction. Which prokaryote should they study?

Accepted Answer

Extreme thermophiles

Question 18

Which of the following is NOT a likely consequence if all prokaryotes disappeared from Earth?

Accepted Answer

Global oxygen levels would immediately increase.

Question 19

Which of the following statements about the evolutionary origins of bacterial flagella is supported by current evidence?

Accepted Answer

Flagella evolved by exaptation, with proteins originally serving other functions.

Question 20

Which of the following is LEAST associated with prokaryotes?

Accepted Answer

Total global photosynthesis

Bacteria and Archaea: Structure, Function, Diversity, and Impact

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