Question 1

Which of the following statements best explains why prokaryotic cells are limited in size by their surface area-to-volume ratio?

Accepted Answer

As prokaryotic cells increase in size, their volume increases faster than their surface area, limiting the rate of nutrient diffusion.

Question 2

A bacterium is observed to have a thick peptidoglycan layer, no outer membrane, and stains purple with Gram stain. Which of the following is most likely true about this bacterium?

Accepted Answer

It is Gram-positive and more sensitive to antibiotics that target peptidoglycan synthesis.

Question 3

Which of the following best describes the function of porins in the outer membrane of Gram-negative bacteria?

Accepted Answer

They form nonspecific channels that allow certain molecules to pass through the outer membrane.

Question 4

A patient is diagnosed with tuberculosis. The causative agent is an acid-fast bacterium. Which property of the cell wall is most responsible for the need for long, multidrug therapy?

Accepted Answer

Presence of a waxy mycolic acid layer that limits drug penetration

Question 5

Which of the following arrangements describes a chain of rod-shaped bacteria?

Accepted Answer

Streptobacilli

Question 6

A scientist observes a prokaryote with a single, circular chromosome, no membrane-bound organelles, and a sterol-enriched plasma membrane but no cell wall. Which genus does this organism most likely belong to?

Accepted Answer

Mycoplasma

Question 7

Which of the following best explains why Gram-negative bacteria are generally more resistant to chemical agents than Gram-positive bacteria?

Accepted Answer

Their outer membrane acts as a selective barrier, excluding many harmful substances.

Question 8

Which of the following is a correct description of the movement of water during osmosis in a hypertonic environment?

Accepted Answer

Water moves out of the cell, resulting in plasmolysis.

Question 9

Which of the following best describes the process of group translocation in prokaryotic cells?

Accepted Answer

A substance is transported across the membrane and chemically modified by the addition of a phosphate group.

Question 10

A bacterium is observed to move toward a chemical attractant. Which term best describes this behavior?

Accepted Answer

Chemotaxis

Question 11

Which of the following structures is most directly involved in the formation of biofilms by allowing bacteria to adhere to surfaces?

Accepted Answer

Fimbriae

Question 12

Which of the following is a distinguishing feature of archaeal plasma membranes compared to bacterial plasma membranes?

Accepted Answer

Archaea have long-branched fatty acids linked by ether bonds.

Question 13

Which of the following best describes the function of teichoic acids in Gram-positive bacteria?

Accepted Answer

They stabilize the cell wall, help maintain shape, and aid in regulation of cell division.

Question 14

A laboratory technician observes a bacterium with a tuft of flagella at one pole. Which term best describes this flagellar arrangement?

Accepted Answer

Lophotrichous

Question 15

Which of the following is true regarding endospores?

Accepted Answer

They are metabolically inactive and highly resistant to heat, drying, and radiation.

Question 16

Which of the following genera are known for producing endospores that can survive in healthcare environments for extended periods?

Accepted Answer

Bacillus and Clostridioides

Question 17

Which of the following best describes the role of the prokaryotic cytoskeleton?

Accepted Answer

It provides structure and support to the cell.

Question 18

A bacterium is placed in a hypotonic solution and its cell wall is damaged. What is the most likely outcome?

Accepted Answer

The cell will swell and may undergo osmotic lysis.

Question 19

Which of the following is a function of the glycocalyx in bacteria?

Accepted Answer

It helps bacteria adhere to surfaces and protects against desiccation.

Question 20

Which of the following best describes the difference between simple diffusion and facilitated diffusion across the prokaryotic plasma membrane?

Accepted Answer

Facilitated diffusion requires membrane proteins, while simple diffusion does not.

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

Guida di studio - Domande di pratica

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