Question 1

Which of the following is a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells lack a nucleus.

Question 2

A bacterial cell is placed in a hypertonic solution. What is the most likely outcome for the cell?

Accepted Answer

The cell will lose water and undergo plasmolysis.

Question 3

Which structure is responsible for the transfer of DNA between bacterial cells during conjugation?

Accepted Answer

Pili

Question 4

Which of the following best describes the function of the glycocalyx capsule in pathogenic bacteria?

Accepted Answer

It prevents recognition and phagocytosis by host immune cells.

Question 5

A scientist observes a cell with a thick peptidoglycan layer and teichoic acids. After Gram staining, the cell appears purple. What type of cell is this?

Accepted Answer

Gram-positive bacterial cell

Question 6

Which of the following equations correctly represents the process of osmosis across a semipermeable membrane?

Accepted Answer

$$J_v = L_p (\Delta P - \sigma \Delta \pi)$$

Question 7

Which of the following is NOT a function of the bacterial cytoplasmic membrane?

Accepted Answer

Protein synthesis

Question 8

A patient is infected with a bacterium that resists desiccation and is difficult to stain. Which cell wall component is most likely responsible for these properties?

Accepted Answer

Mycolic acid

Question 9

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

Accepted Answer

They possess an outer membrane containing lipopolysaccharide (LPS).

Question 10

Which of the following structures is found in both prokaryotic and eukaryotic cells and is the site of protein synthesis?

Accepted Answer

Ribosome

Question 11

A researcher is studying a microorganism with a cell wall composed of chitin. Which group does this organism most likely belong to?

Accepted Answer

Fungi

Question 12

Which of the following best describes the function of endospores in bacteria?

Accepted Answer

They serve as a defensive strategy against unfavorable conditions.

Question 13

Which of the following is a unique feature of archaeal cell walls compared to bacterial cell walls?

Accepted Answer

Contain specialized polysaccharides and proteins, but lack peptidoglycan

Question 14

A eukaryotic cell is observed to have an extensive network of tubulin microtubules, actin microfilaments, and intermediate filaments. What is the primary function of this network?

Accepted Answer

Anchoring organelles and maintaining cell shape

Question 15

Which of the following best describes the endosymbiotic theory for the origin of mitochondria?

Accepted Answer

Mitochondria originated from small aerobic prokaryotes that became internal parasites of larger anaerobic prokaryotes.

Question 16

Which of the following transport processes requires energy and results in the chemical modification of the transported substance?

Accepted Answer

Group translocation

Question 17

A scientist is studying a cell with a single circular DNA molecule, 70S ribosomes, and a fibrous cytoskeleton. The cell lacks peptidoglycan in its wall. Which type of organism is this most likely to be?

Accepted Answer

Archaeon

Question 18

Which of the following is a function of eukaryotic cilia?

Accepted Answer

Coordinated beating to propel the cell or move substances past the cell surface

Question 19

Which of the following best explains why the fluid mosaic model is used to describe the cytoplasmic membrane?

Accepted Answer

The membrane is a dynamic structure with proteins and lipids that can move laterally within the layer.

Cell Structure and Function in Microbiology: Prokaryotic and Eukaryotic Cells

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