Question 1

Which of the following statements best explains why prokaryotes are considered 'masters of adaptation'?

Accepted Answer

They possess astonishing genetic diversity and can thrive in extreme environments due to rapid evolution and metabolic versatility.

Question 2

Which feature is shared by all prokaryotic cell walls?

Accepted Answer

They contain peptidoglycan, a network of sugar polymers cross-linked by polypeptides.

Question 3

A scientist is studying two bacterial samples. One stains purple with Gram stain, and the other stains pink. What is the most likely structural difference between these two bacteria?

Accepted Answer

The purple-staining bacteria have a thick peptidoglycan layer, while the pink-staining bacteria have a thin peptidoglycan layer and an outer membrane.

Question 4

Which structure allows prokaryotes to adhere to surfaces and to each other, often forming colonies?

Accepted Answer

Capsule

Question 5

What is the primary function of the sex pilus in bacterial cells?

Accepted Answer

To allow bacteria to exchange DNA by conjugation

Question 6

Which statement about prokaryotic genomes is correct?

Accepted Answer

Most prokaryotes have a circular chromosome and may also have small rings of DNA called plasmids.

Question 7

A bacterium is found to survive boiling temperatures and desiccation for extended periods. Which adaptation most likely allows this?

Accepted Answer

Formation of endospores

Question 8

Which process directly increases genetic diversity in prokaryotes by the uptake of foreign DNA from the environment?

Accepted Answer

Transformation

Question 9

A hospital isolates a strain of bacteria that is resistant to multiple antibiotics. Which genetic element is most likely responsible for this resistance?

Accepted Answer

R plasmid

Question 10

Which equation best represents the exponential growth of a bacterial population by binary fission, where $$N_0 is $$the initial number of cells and $$n is $$the number of generations?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 11

Which of the following is NOT a factor that contributes to genetic diversity in prokaryotes?

Accepted Answer

Mitosis

Question 12

During conjugation, what is the role of the F factor in bacteria?

Accepted Answer

It is required for the production of sex pili and transfer of DNA between cells.

Question 13

Which process involves the movement of genes between bacteria by bacteriophages?

Accepted Answer

Transduction

Question 14

A researcher observes that a bacterial population evolves rapidly in response to a new antibiotic. Which factor most directly explains this rapid evolution?

Accepted Answer

High diversity from mutations and rapid reproduction

Question 15

Which of the following best describes the organization of prokaryotic cells?

Accepted Answer

They lack membrane-bound organelles but may have specialized infoldings of the plasma membrane.

Question 16

Which adaptation allows some prokaryotes to move toward or away from stimuli?

Accepted Answer

Flagella

Question 17

Which of the following is a correct statement about the difference between Bacteria and Archaea?

Accepted Answer

Archaea are more closely related to Eukarya than to Bacteria.

Question 18

Which scenario best illustrates the ecological interactions of prokaryotes?

Accepted Answer

Bacteria form biofilms on rocks in a stream, interacting with each other and the environment.

Question 19

Which of the following best explains why mutation rates during binary fission are important for prokaryotic evolution?

Accepted Answer

Even though mutation rates are low, rapid reproduction allows mutations to accumulate quickly, leading to rapid evolution.

Bacteria and Archaea: Structure, Adaptation, and Genetic Diversity

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