ATI RN
free microbiology test bank questions pdf Questions
Question 1 of 5
In order to prevent wound infection associated with surgical procedures a patient was given a synthetic antiprotozoan drug with a high activity against Helicobacter pylori. Specify this drug:
Correct Answer: A
Rationale: The correct answer is A: Metronidazole. Metronidazole is a synthetic antiprotozoan drug with high activity against Helicobacter pylori, a bacterium that can cause wound infections. Metronidazole specifically targets anaerobic bacteria like H. pylori, making it effective in preventing wound infections.
Incorrect choices:
B: Doxycycline hydrochloride - Doxycycline is primarily used for bacterial infections, not protozoan infections like H. pylori.
C: Chingamin - Chingamin is not a commonly used drug for treating H. pylori infections or preventing wound infections.
D: Acyclovir - Acyclovir is an antiviral drug used to treat herpes infections, not bacterial or protozoan infections like H. pylori.
Question 2 of 5
Listeria monocytogenes are:
Correct Answer: C
Rationale: The correct answer is C: Gram-positive rod-shaped bacteria. Listeria monocytogenes is a Gram-positive bacterium, as it retains the crystal violet stain during the Gram staining process. The bacteria are rod-shaped, not spherical.
Choice A is incorrect as Listeria monocytogenes is not Gram-negative.
Choice D is incorrect as Listeria monocytogenes does fall under the category of Gram-positive bacteria. The key is to remember the characteristics of Listeria monocytogenes, which are Gram-positive and rod-shaped.
Question 3 of 5
Which of the following bacteria is known for causing the disease known as whooping cough?
Correct Answer: A
Rationale: The correct answer is A: Bordetella pertussis. This bacterium is known for causing whooping cough due to its ability to produce toxins that damage the respiratory tract, leading to severe coughing fits. Clostridium tetani causes tetanus, Haemophilus influenzae can cause respiratory infections but not whooping cough, and Staphylococcus aureus is more commonly associated with skin infections.
Therefore, A is the correct choice based on its specific association with the disease in question.
Question 4 of 5
A patient who has been taking tetracycline for a long time has developed candidosis of mucous membranes. What drug shoul administered for its treatment?
Correct Answer: A
Rationale: The correct answer is A: Itraconazole. Itraconazole is an antifungal medication commonly used to treat candidosis. It works by inhibiting the synthesis of ergosterol, a key component of fungal cell membranes. This action disrupts the integrity of the fungal cell membrane, leading to cell death. Griseofulvin (
B) is primarily used to treat fungal infections of the skin and nails, not mucous membranes. Nitrofungin (
C) is not commonly used for candidosis treatment. Amphotericin (
D) is a potent antifungal medication but is typically reserved for severe or systemic fungal infections due to its potential side effects.
Question 5 of 5
Which of the following bacteria is known for producing a biofilm on medical devices?
Correct Answer: B
Rationale: The correct answer is B: Pseudomonas aeruginosa. This bacterium is known for producing biofilms on medical devices due to its ability to adhere and form a slimy layer that protects it from antibiotics and the host immune system. Pseudomonas aeruginosa is commonly associated with healthcare-associated infections.
Clostridium tetani (
A) causes tetanus, not known for biofilm production on medical devices. Salmonella enterica (
C) causes foodborne illnesses, not typically associated with medical device biofilms. Staphylococcus aureus (
D) is a common pathogen in healthcare settings but is not specifically known for biofilm production on medical devices.