Question 1

Which of the following structures is found in all bacteria, regardless of species or environment?

Accepted Answer

Cytoplasmic membrane

Question 2

A patient presents with a bacterial infection. The bacteria are observed to form chains of spherical cells. Which term best describes this arrangement?

Accepted Answer

Streptococci

Question 3

Which of the following best explains why gram-positive cell walls are generally stronger than gram-negative cell walls?

Accepted Answer

Gram-positive cell walls contain a thick layer of peptidoglycan.

Question 4

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

Accepted Answer

Pili

Question 5

A bacterium is observed to move toward a source of glucose. What is the term for this type of movement?

Accepted Answer

Positive chemotaxis

Question 6

Which of the following is a function of the bacterial glycocalyx when present as a capsule?

Accepted Answer

Protects against phagocytosis by white blood cells

Question 7

Which of the following statements about Mycoplasmas is correct?

Accepted Answer

They display extreme variations in shape due to lack of cell walls.

Question 8

A researcher is studying a bacterium that survives boiling, radiation, and chemical disinfectants. Which structure is most likely responsible for this resistance?

Accepted Answer

Endospore

Question 9

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

Accepted Answer

Protein synthesis

Question 10

Which component of the gram-negative outer membrane can cause severe symptoms in humans, such as fever and shock?

Accepted Answer

Lipopolysaccharide (LPS)

Question 11

A bacterium is described as 'lophotrichous.' What does this mean about its flagella?

Accepted Answer

It has small bunches or tufts of flagella at one or both ends.

Question 12

Which of the following best describes the process of bacterial 'run' during chemotaxis?

Accepted Answer

Flagella rotate counterclockwise, propelling the cell in a straight line.

Question 13

Which of the following is a correct match between a bacterial shape and its description?

Accepted Answer

Curved: vibrio, spirillum, spirochete

Question 14

Which of the following is a major difference between bacterial and archaeal cell walls?

Accepted Answer

Archaeal cell walls lack true peptidoglycan.

Question 15

Which of the following is a correct statement about bacterial ribosomes?

Accepted Answer

They are 70S and differ from eukaryotic ribosomes.

Question 16

Which division in Bergey's Manual includes bacteria with no cell wall and a soft structure?

Accepted Answer

Tenericutes

Question 17

A hospital laboratory needs to quickly identify an unknown bacterial pathogen based on its shape, staining, and biochemical reactions. Which resource should they use?

Accepted Answer

Bergey's Manual of Determinative Bacteriology

Question 18

Which of the following best describes the role of porin proteins in the gram-negative outer membrane?

Accepted Answer

They allow selective passage of small molecules.

Question 19

Which of the following is a correct definition of 'pleomorphism' in bacteria?

Accepted Answer

Variation in size and shape among cells of a single species

Question 20

Which of the following diseases is NOT caused by an endospore-forming bacterium?

Accepted Answer

Tuberculosis

Bacteria and Archaea: Structure, Function, and Classification

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