Question 1

Which of the following statements best describes a key structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus surrounded by a nuclear envelope, whereas prokaryotic cells have a nucleoid region without a membrane.

Question 2

A bacterial cell is observed to have a thick, well-organized glycocalyx. Which of the following is a likely consequence of this structure?

Accepted Answer

The bacterium will have increased virulence due to protection from host defenses.

Question 3

Which of the following best distinguishes a capsule from a slime layer in bacteria?

Accepted Answer

A capsule is tightly bound and organized, while a slime layer is loosely attached and unorganized.

Question 4

A microbiologist observes a chain of spherical bacterial cells under the microscope. Which term best describes this arrangement and shape?

Accepted Answer

Streptococcus

Question 5

Why do bacteria form specific arrangements such as tetrads or sarcinae?

Accepted Answer

Because of the direction and pattern of cell division and whether the cells remain attached after division.

Question 6

Which of the following structures is primarily responsible for bacterial conjugation?

Accepted Answer

Conjugation pilus

Question 7

A bacterium with flagella distributed all over its surface is described as having which flagellar arrangement?

Accepted Answer

Peritrichous

Question 8

Which of the following best explains how penicillin inhibits bacterial growth?

Accepted Answer

It interferes with the synthesis of peptidoglycan, weakening the cell wall.

Question 9

Which component is found in the outer membrane of Gram-negative bacteria and is responsible for many of their toxic effects?

Accepted Answer

Lipopolysaccharide (LPS)

Question 10

A patient is diagnosed with tuberculosis, caused by Mycobacterium tuberculosis. Which feature of this bacterium's cell wall makes it acid-fast?

Accepted Answer

The presence of mycolic acids

Question 11

Which of the following best describes the function of the prokaryotic plasma membrane?

Accepted Answer

It acts as a selective barrier, controlling the movement of substances in and out of the cell.

Question 12

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

Accepted Answer

Water will move out of the cell, causing plasmolysis.

Question 13

Which of the following statements about prokaryotic ribosomes is correct?

Accepted Answer

They are 70S in size and are the target of certain antibiotics.

Question 14

Why is the difference between prokaryotic and eukaryotic ribosomes clinically important?

Accepted Answer

Because antibiotics can selectively target prokaryotic ribosomes without affecting eukaryotic ribosomes.

Question 15

Which of the following best describes a plasmid?

Accepted Answer

A small, circular piece of DNA that replicates independently of the bacterial chromosome.

Question 16

Which of the following is an example of a bacterial inclusion and its function?

Accepted Answer

Magnetosome; allows bacteria to orient along magnetic fields.

Question 17

Which two genera of bacteria are known for producing endospores?

Accepted Answer

Bacillus and Clostridium

Question 18

What typically triggers the production of endospores in bacteria?

Accepted Answer

Nutrient depletion or harsh environmental conditions

Question 19

A patient is infected with Mycoplasma pneumoniae. Which feature distinguishes this organism from most other bacteria?

Accepted Answer

It lacks a cell wall entirely.

Question 20

A scientist is studying a bacterium that moves toward a chemical attractant. Which term best describes this behavior, and which structure is primarily responsible?

Accepted Answer

Chemotaxis; flagella

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