Question 1

Flagella are

Accepted Answer

A) protein filaments which enable bacterial cells to move. 
B) found only in Gram-positive bacteria. 
C) hair-like appendages on bacterial cells that detect nutrients in the environment. 
D) structures that enable bacteria to attach to surfaces. 
E) important for cell division in bacterial cells. 
A) protein filaments which enable bacterial cells to move. 
B) found only in Gram-positive bacteria. 
C) hair-like appendages on bacterial cells that detect nutrients in the environment. 
D) structures that enable bacteria to attach to surfaces. 
E) important for cell division in bacterial cells. A

Question 2

Which of the following statements about phage typing is FALSE?

Accepted Answer

A) All bacteria can be typed by the use of the appropriate bacteriophage. 
B) Phage typing relies on the ability of a phage to infect a specific bacterial cell. 
C) Bacteriophage destroy the cells they infect. 
D) Phage typing is useful in epidemiology studies. 
E) Phage typing can be performed on bacteria grown on agar plates. 
A) All bacteria can be typed by the use of the appropriate bacteriophage. 
B) Phage typing relies on the ability of a phage to infect a specific bacterial cell. 
C) Bacteriophage destroy the cells they infect. 
D) Phage typing is useful in epidemiology studies. 
E) Phage typing can be performed on bacteria grown on agar plates. A

Question 3

Which of the following opportunistic pathogens is a frequent cause of infection in burns patients?

Accepted Answer

A) Clostridium tetani. 
B) Pseudomonas aeruginosa. 
C) Group B streptococci. 
D) Salmonella. 
E) Mycobacterium tuberculosis. 
A) Clostridium tetani. 
B) Pseudomonas aeruginosa. 
C) Group B streptococci. 
D) Salmonella. 
E) Mycobacterium tuberculosis. B

Question 4

Which of the following methods is used to differentiate between different strains of bacteria?

Accepted Answer

A) Phage typing. 
B) DNA typing. 
C) Pulse field gel electrophoresis. 
D) Biochemical tests. 
E) All of the above. 
A) Phage typing. 
B) DNA typing. 
C) Pulse field gel electrophoresis. 
D) Biochemical tests. 
E) All of the above.

Question 5

Bacteria that infect humans grow best at

Accepted Answer

A) pH 6.5 and 37OC. 
B) pH 7.4 and 37OC. 
C) pH 6.8 and 40OC. 
D) pH 7.4 and 40OC. 
E) ph 7.8 and 37OC. 
A) pH 6.5 and 37OC. 
B) pH 7.4 and 37OC. 
C) pH 6.8 and 40OC. 
D) pH 7.4 and 40OC. 
E) ph 7.8 and 37OC.

Question 6

The polysaccharide layer surrounding some bacteria is called a

Accepted Answer

A) waxy layer. 
B) capsid. 
C) basal body. 
D) glycocalyx. 
E) any of the above. 
A) waxy layer. 
B) capsid. 
C) basal body. 
D) glycocalyx. 
E) any of the above.

Question 7

Gram-positive bacteria differ from Gram-negative bacteria because Gram-positives

Accepted Answer

A) have a different cell wall structure. 
B) contain a thicker layer of peptidoglycan. 
C) stain blue with the Gram stain. 
D) are generally more susceptible to penicillin. 
E) all of the above. 
A) have a different cell wall structure. 
B) contain a thicker layer of peptidoglycan. 
C) stain blue with the Gram stain. 
D) are generally more susceptible to penicillin. 
E) all of the above.

Question 8

The cellular structure which is primarily responsible for determining which substances enter and leave the cell is the

Accepted Answer

A) cell wall. 
B) cell membrane. 
C) peptidoglycan layer. 
D) capsule. 
E) teichoic acid layer 
A) cell wall. 
B) cell membrane. 
C) peptidoglycan layer. 
D) capsule. 
E) teichoic acid layer

Question 9

A bacterium that can grow in the presence or absence of oxygen is called a(n)

Accepted Answer

A) obligate anaerobe. 
B) obligate aerobe. 
C) mesophile. 
D) facultative anaerobe. 
E) heterotroph 
A) obligate anaerobe. 
B) obligate aerobe. 
C) mesophile. 
D) facultative anaerobe. 
E) heterotroph

Question 10

A bacterium with spherical cells that exist in pairs would be termed a

Accepted Answer

A) staphylococcus. 
B) bacillus. 
C) diplococcus. 
D) vibrio. 
E) streptococcus. 
A) staphylococcus. 
B) bacillus. 
C) diplococcus. 
D) vibrio. 
E) streptococcus.

Question 11

Bacteria which can have more than one cell shape are described as

Accepted Answer

A) pleomorphic. 
B) heterotrophic. 
C) actinomycetes. 
D) archaebacteria. 
E) pathogenic. 
A) pleomorphic. 
B) heterotrophic. 
C) actinomycetes. 
D) archaebacteria. 
E) pathogenic.

Question 12

Which of the following organisms has been shown to be implicated in the formation of gastric ulcers?

Accepted Answer

A) Salmonella typhimurium. 
B) Campylobacter jejuni. 
C) Escherichia coli 0157. 
D) Helicobacter pylori. 
E) Staphylococcus aureus. 
A) Salmonella typhimurium. 
B) Campylobacter jejuni. 
C) Escherichia coli 0157. 
D) Helicobacter pylori. 
E) Staphylococcus aureus.

Question 13

Endospores can be destroyed

Accepted Answer

A) by autoclaving at 121OC for 15 minutes. 
B) by boiling for one hour. 
C) by exposure to most disinfectants for 15 minutes. 
D) only by incineration. 
E) by treating with chlorine bleach. 
A) by autoclaving at 121OC for 15 minutes. 
B) by boiling for one hour. 
C) by exposure to most disinfectants for 15 minutes. 
D) only by incineration. 
E) by treating with chlorine bleach.

Question 14

Peptidoglycan is a substance that

Accepted Answer

A) is found in Gram-positive,but not Gram-negative,bacterial cells. 
B) forms a layer in bacterial cell membranes. 
C) plays a role in antibiotic resistance. 
D) consists of a polymer of lipopolysaccharides. 
E) consists of a carbohydrate chain with peptide cross bridges. 
A) is found in Gram-positive,but not Gram-negative,bacterial cells. 
B) forms a layer in bacterial cell membranes. 
C) plays a role in antibiotic resistance. 
D) consists of a polymer of lipopolysaccharides. 
E) consists of a carbohydrate chain with peptide cross bridges.

Question 15

A major component of the cell wall of Gram-positive bacteria is

Accepted Answer

A) lipopolysaccharide. 
B) phospholipid. 
C) peptidoglycan. 
D) lipoproteins. 
E) protein. 
A) lipopolysaccharide. 
B) phospholipid. 
C) peptidoglycan. 
D) lipoproteins. 
E) protein.

Question 16

When viewed under the microscope,the shape of the organism responsible for cholera would be

Accepted Answer

A) round. 
B) rod-shaped. 
C) a corkscrew. 
D) comma-shaped. 
E) a spiral. 
A) round. 
B) rod-shaped. 
C) a corkscrew. 
D) comma-shaped. 
E) a spiral.

Question 17

The Gram-negative bacillus that is a normal inhabitant of the human intestine is

Accepted Answer

A) Clostridium difficile. 
B) Pseudomonas aeruginosa. 
C) Campylobacter jejuni. 
D) Vibrio cholerae. 
E) Escherichia coli. 
A) Clostridium difficile. 
B) Pseudomonas aeruginosa. 
C) Campylobacter jejuni. 
D) Vibrio cholerae. 
E) Escherichia coli.

Question 18

Which of the following bacteria can produce endospores?

Accepted Answer

A) Staphylococcus aureus. 
B) Clostridium perfringens. 
C) Streptococcus pneumoniae. 
D) Escherichia coli. 
E) Streptococcus pyogenes. 
A) Staphylococcus aureus. 
B) Clostridium perfringens. 
C) Streptococcus pneumoniae. 
D) Escherichia coli. 
E) Streptococcus pyogenes.

Question 19

Which of the following statements about flagella is TRUE?

Accepted Answer

A) They enable bacteria to move. 
B) They assist in chemotaxis. 
C) They are attached to the cell wall by a series of concentric protein rings. 
D) They propel the cell by a propeller-like motion. 
E) All of the above. 
A) They enable bacteria to move. 
B) They assist in chemotaxis. 
C) They are attached to the cell wall by a series of concentric protein rings. 
D) They propel the cell by a propeller-like motion. 
E) All of the above.

Question 20

The DNA that codes for the basic structure and function of a bacterium is

Accepted Answer

A) contained in a single circular chromosome. 
B) single stranded in a double helix. 
C) contained in the nucleus. 
D) usually in the form of a plasmid. 
E) contained within a membrane-bound vesicle. 
A) contained in a single circular chromosome. 
B) single stranded in a double helix. 
C) contained in the nucleus. 
D) usually in the form of a plasmid. 
E) contained within a membrane-bound vesicle.

Exam 3: Bacteria

Flagella are

Which of the following statements about phage typing is FALSE?

Which of the following opportunistic pathogens is a frequent cause of infection in burns patients?

Which of the following methods is used to differentiate between different strains of bacteria?

Bacteria that infect humans grow best at

The polysaccharide layer surrounding some bacteria is called a

Gram-positive bacteria differ from Gram-negative bacteria because Gram-positives

The cellular structure which is primarily responsible for determining which substances enter and leave the cell is the

A bacterium that can grow in the presence or absence of oxygen is called a(n)

A bacterium with spherical cells that exist in pairs would be termed a

Bacteria which can have more than one cell shape are described as

Which of the following organisms has been shown to be implicated in the formation of gastric ulcers?

Endospores can be destroyed

Peptidoglycan is a substance that

A major component of the cell wall of Gram-positive bacteria is

When viewed under the microscope,the shape of the organism responsible for cholera would be

The Gram-negative bacillus that is a normal inhabitant of the human intestine is

Which of the following bacteria can produce endospores?

Which of the following statements about flagella is TRUE?

The DNA that codes for the basic structure and function of a bacterium is

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