,NURS 251 Pharmacology Module Exam 6 | Portage Learning /
nursing / Geneva College | 2026 Edition (PDF)
1. Which of the following best defines an antibiotic?
A) A drug that destroys viruses and prevents their replication
B) A drug that destroys bacteria or interferes with their growth and replication
C) A medication that reduces inflammation and fever
D) A substance produced by the body to fight off all pathogens
Correct Answer: A drug that destroys bacteria or interferes with their growth and replication
Rationale: Antibiotics are specifically designed to target bacteria by either destroying them (bactericidal)
or inhibiting their growth (bacteriostatic). They are not effective against viruses; antiviral medications
are used for viral infections. Anti-inflammatory drugs reduce inflammation, and antibodies are the
body's natural defense proteins.
2. The Gram stain procedure differentiates bacteria based on which structural characteristic?
A) Presence of a nucleus
B) Composition of the cell wall
C) Method of reproduction
D) Ability to form spores
Correct Answer: Composition of the cell wall
Rationale: The Gram stain differentiates bacteria based on the composition of their cell wall. Gram-
positive bacteria have a thick peptidoglycan layer and stain purple, while Gram-negative bacteria have a
thin peptidoglycan layer and an outer membrane, staining pink.
3. A nurse is caring for a patient with a bacterial infection. The laboratory report identifies the organism
as Gram-negative. Which statement about Gram-negative bacteria is accurate?
A) They are generally easier to treat than Gram-positive bacteria
,B) They have a simpler cell wall structure than Gram-positive bacteria
C) They are typically harder to treat due to a more complex cell wall
D) They always respond to penicillin-based antibiotics
Correct Answer: They are typically harder to treat due to a more complex cell wall
Rationale: Gram-negative bacteria possess an outer membrane that acts as an additional barrier, making
them more resistant to certain antibiotics and generally harder to treat than Gram-positive organisms.
Penicillin is more effective against Gram-positive bacteria due to their simpler cell wall structure.
4. A patient asks the nurse about the difference between an aerobic and an anaerobic bacterium. Which
response is correct?
A) Anaerobic bacteria require oxygen to grow
B) Aerobic bacteria do not require oxygen to grow
C) Anaerobic bacteria do not require oxygen to grow
D) Both types of bacteria require the same conditions to grow
Correct Answer: Anaerobic bacteria do not require oxygen to grow
Rationale: Aerobic bacteria require oxygen for growth and survival, while anaerobic bacteria thrive in
environments without oxygen and may even be killed by its presence. Anaerobes are commonly found
in the gastrointestinal tract.
5. A patient is diagnosed with strep throat. The nurse knows that this infection is most commonly
caused by which bacterium?
A) Streptococcus pneumoniae
B) Streptococcus pyogenes
C) Staphylococcus aureus
D) Escherichia coli
Correct Answer: Streptococcus pyogenes
, Rationale: Strep throat is most commonly caused by Streptococcus pyogenes, also known as Group A
Streptococcus. Streptococcus pneumoniae is more commonly associated with pneumonia, meningitis,
and otitis media.
6. Which of the following is a common ailment associated with Streptococcus pneumoniae?
A) Strep throat
B) Pneumonia
C) Urinary tract infection
D) Skin abscess
Correct Answer: Pneumonia
Rationale: Streptococcus pneumoniae is a leading cause of community-acquired pneumonia. It can also
cause meningitis, otitis media, and sinusitis. It is not the primary cause of strep throat, UTIs, or typical
skin abscesses.
7. The nurse is educating a patient about healthcare-associated infections (HAIs). Which statement by
the patient indicates a need for further teaching?
A) "HAIs are infections acquired in a healthcare setting."
B) "HAIs can be caused by bacteria that are resistant to antibiotics."
C) "HAIs are easier to treat because the patient is already in the hospital."
D) "Proper hand hygiene is important to prevent HAIs."
Correct Answer: "HAIs are easier to treat because the patient is already in the hospital."
Rationale: This statement is incorrect. Healthcare-associated infections are often more difficult to treat
because they are frequently caused by antibiotic-resistant organisms. The patient's statement indicates
a misunderstanding of the seriousness of HAIs.
8. Which of the following is an example of a Gram-positive bacterium?
nursing / Geneva College | 2026 Edition (PDF)
1. Which of the following best defines an antibiotic?
A) A drug that destroys viruses and prevents their replication
B) A drug that destroys bacteria or interferes with their growth and replication
C) A medication that reduces inflammation and fever
D) A substance produced by the body to fight off all pathogens
Correct Answer: A drug that destroys bacteria or interferes with their growth and replication
Rationale: Antibiotics are specifically designed to target bacteria by either destroying them (bactericidal)
or inhibiting their growth (bacteriostatic). They are not effective against viruses; antiviral medications
are used for viral infections. Anti-inflammatory drugs reduce inflammation, and antibodies are the
body's natural defense proteins.
2. The Gram stain procedure differentiates bacteria based on which structural characteristic?
A) Presence of a nucleus
B) Composition of the cell wall
C) Method of reproduction
D) Ability to form spores
Correct Answer: Composition of the cell wall
Rationale: The Gram stain differentiates bacteria based on the composition of their cell wall. Gram-
positive bacteria have a thick peptidoglycan layer and stain purple, while Gram-negative bacteria have a
thin peptidoglycan layer and an outer membrane, staining pink.
3. A nurse is caring for a patient with a bacterial infection. The laboratory report identifies the organism
as Gram-negative. Which statement about Gram-negative bacteria is accurate?
A) They are generally easier to treat than Gram-positive bacteria
,B) They have a simpler cell wall structure than Gram-positive bacteria
C) They are typically harder to treat due to a more complex cell wall
D) They always respond to penicillin-based antibiotics
Correct Answer: They are typically harder to treat due to a more complex cell wall
Rationale: Gram-negative bacteria possess an outer membrane that acts as an additional barrier, making
them more resistant to certain antibiotics and generally harder to treat than Gram-positive organisms.
Penicillin is more effective against Gram-positive bacteria due to their simpler cell wall structure.
4. A patient asks the nurse about the difference between an aerobic and an anaerobic bacterium. Which
response is correct?
A) Anaerobic bacteria require oxygen to grow
B) Aerobic bacteria do not require oxygen to grow
C) Anaerobic bacteria do not require oxygen to grow
D) Both types of bacteria require the same conditions to grow
Correct Answer: Anaerobic bacteria do not require oxygen to grow
Rationale: Aerobic bacteria require oxygen for growth and survival, while anaerobic bacteria thrive in
environments without oxygen and may even be killed by its presence. Anaerobes are commonly found
in the gastrointestinal tract.
5. A patient is diagnosed with strep throat. The nurse knows that this infection is most commonly
caused by which bacterium?
A) Streptococcus pneumoniae
B) Streptococcus pyogenes
C) Staphylococcus aureus
D) Escherichia coli
Correct Answer: Streptococcus pyogenes
, Rationale: Strep throat is most commonly caused by Streptococcus pyogenes, also known as Group A
Streptococcus. Streptococcus pneumoniae is more commonly associated with pneumonia, meningitis,
and otitis media.
6. Which of the following is a common ailment associated with Streptococcus pneumoniae?
A) Strep throat
B) Pneumonia
C) Urinary tract infection
D) Skin abscess
Correct Answer: Pneumonia
Rationale: Streptococcus pneumoniae is a leading cause of community-acquired pneumonia. It can also
cause meningitis, otitis media, and sinusitis. It is not the primary cause of strep throat, UTIs, or typical
skin abscesses.
7. The nurse is educating a patient about healthcare-associated infections (HAIs). Which statement by
the patient indicates a need for further teaching?
A) "HAIs are infections acquired in a healthcare setting."
B) "HAIs can be caused by bacteria that are resistant to antibiotics."
C) "HAIs are easier to treat because the patient is already in the hospital."
D) "Proper hand hygiene is important to prevent HAIs."
Correct Answer: "HAIs are easier to treat because the patient is already in the hospital."
Rationale: This statement is incorrect. Healthcare-associated infections are often more difficult to treat
because they are frequently caused by antibiotic-resistant organisms. The patient's statement indicates
a misunderstanding of the seriousness of HAIs.
8. Which of the following is an example of a Gram-positive bacterium?
