Question 1

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

Accepted Answer

Eukaryotic cells have a nucleus surrounded by a nuclear envelope, while prokaryotic cells lack a true nucleus.

Question 2

A cluster of spherical bacterial cells is observed under a microscope. Which term best describes this arrangement?

Accepted Answer

Staphylococci

Question 3

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

Accepted Answer

It helps bacteria evade phagocytosis and adhere to surfaces.

Question 4

A bacterium with a capsule is generally considered:

Accepted Answer

More virulent than a non-capsulated bacterium.

Question 5

Which arrangement of flagella would you expect to find on a bacterium that is highly motile and can change direction rapidly?

Accepted Answer

Peritrichous

Question 6

What is the main difference between fimbriae and pili?

Accepted Answer

Fimbriae are numerous and used for attachment, while pili are fewer and involved in conjugation.

Question 7

Which of the following statements about Gram-negative cell walls is correct?

Accepted Answer

They contain lipopolysaccharides in the outer membrane.

Question 8

Teichoic acids are found in which type of bacterial cell wall, and what is their function?

Accepted Answer

Gram-positive; they help maintain cell wall structure and regulate cation movement.

Question 9

The Fluid Mosaic Model describes the structure of which cellular component?

Accepted Answer

Plasma membrane

Question 10

Which property of the plasma membrane allows it to control the movement of substances into and out of the cell?

Accepted Answer

Selective permeability

Question 11

A scientist discovers a bacterium that survives extreme heat and desiccation. Which structure is most likely responsible for this resistance?

Accepted Answer

Endospore

Question 12

Which of the following best explains why endospores are formed?

Accepted Answer

To enable bacteria to survive unfavorable environmental conditions.

Question 13

During the Gruinard Island incident, what was the primary microbiological concern?

Accepted Answer

The persistence of Bacillus anthracis endospores in the environment.

Question 14

Which of the following best describes the nucleoid in a prokaryotic cell?

Accepted Answer

A region containing circular DNA not surrounded by a membrane.

Question 15

Which of the following equations best represents the selective permeability of the plasma membrane, considering the rate of diffusion ($$J) of a $$solute across the membrane?

Accepted Answer

$$J = -D \, \frac{dC}{dx}$$

Question 16

A Gram-positive bacterium is treated with lysozyme, which breaks down peptidoglycan. What is the most likely outcome?

Accepted Answer

The cell will lose its shape and may lyse due to osmotic pressure.

Question 17

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

Accepted Answer

Protein synthesis.

Question 18

If a bacterium possesses both fimbriae and a capsule, which of the following is most likely true?

Accepted Answer

It is more likely to evade host immune responses and form biofilms.

Question 19

Which of the following best describes the chemical structure of a phospholipid found in the plasma membrane?

Accepted Answer

A molecule with a hydrophilic head and two hydrophobic tails.

Question 20

Which of the following statements about ribosomes in prokaryotic cells is correct?

Accepted Answer

They are the site of protein synthesis.

Anatomy of Prokaryotic & Eukaryotic Cells: Microbiology Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard