Question 1

Which of the following statements best describes a key difference between Bacteria and Archaea?

Accepted Answer

Bacteria include many known human pathogens, while Archaea do not.

Question 2

Why are prokaryotic cells generally limited in size compared to eukaryotic cells?

Accepted Answer

Their reliance on diffusion for nutrient uptake limits their size due to the surface area-to-volume ratio.

Question 3

A bacterium that can change its shape depending on environmental conditions is described as:

Accepted Answer

Pleomorphic

Question 4

Which of the following best explains why Mycobacterium tuberculosis requires special staining techniques?

Accepted Answer

It contains mycolic acid in its cell wall, making it acid-fast and resistant to standard Gram staining.

Question 5

During binary fission, what is the correct sequence of events?

Accepted Answer

Chromosome replicates, cell elongates, septum forms, cell divides.

Question 6

Which of the following is a characteristic unique to Gram-negative bacteria?

Accepted Answer

Outer membrane containing lipopolysaccharide (LPS)

Question 7

A patient is infected with a bacterium that survives boiling and exposure to harsh chemicals. Which structure is most likely responsible for this resistance?

Accepted Answer

Endospore

Question 8

Which of the following best describes the function of bacterial pili?

Accepted Answer

Attachment to surfaces and transfer of genetic material during conjugation

Question 9

A Gram-negative bacterium is placed in a hypotonic solution. What is the most likely outcome if its cell wall is damaged?

Accepted Answer

The cell will lyse due to water influx.

Question 10

Which of the following transport mechanisms requires energy in the form of ATP and can move substances against their concentration gradient?

Accepted Answer

Primary active transport

Question 11

Which of the following best explains why Gram-negative bacteria are generally more resistant to antibiotics that target peptidoglycan?

Accepted Answer

Their outer membrane acts as a selective barrier, limiting drug access to the peptidoglycan.

Question 12

Which of the following equations correctly represents the surface area-to-volume ratio for a spherical bacterial cell of radius $$r$$?

Accepted Answer

$$\frac{4 \pi r^2$}{\frac{4}{3} \pi r^3$}$$

Question 13

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

Accepted Answer

Facilitating DNA replication

Question 14

A bacterium with peritrichous flagella is most likely to:

Accepted Answer

Have flagella distributed all over its surface

Question 15

Which of the following best describes the role of inclusion bodies in prokaryotic cells?

Accepted Answer

Storage of nutrients and other substances

Question 16

Which of the following is a clinically significant implication of a bacterium being acid-fast?

Accepted Answer

It requires prolonged drug therapy due to slow growth and resistance to many antibiotics.

Question 17

Which of the following best explains why Mycoplasma pneumoniae is resistant to penicillin?

Accepted Answer

It lacks a cell wall, so penicillin has no target.

Question 18

A Gram-positive bacterium is placed in a hypertonic solution. What is the most likely cellular response?

Accepted Answer

The cell will lose water and undergo plasmolysis.

Question 19

Which of the following best describes the function of bacterial ribosomes?

Accepted Answer

Protein synthesis

Question 20

Which of the following is a correct statement about endospore formation?

Accepted Answer

Endospores allow bacteria to survive extreme environmental conditions.

Introduction to Prokaryotic Cells: Structure, Function, and Clinical Relevance

Guida di studio - Domande di pratica

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