ATI RN
microbiology chapter 14 test bank Questions
Question 1 of 5
Differentiating media are:
Correct Answer: C
Rationale: The correct answer is C because Endo, Gassner, and Levin are all examples of differential media used in microbiology. These media contain specific components that allow for the differentiation of different types of microorganisms based on their metabolic characteristics or biochemical reactions. Lowenstein-Jensen and Petraniani (choice
A) are selective media for mycobacteria, not differential. Apoholate-citrate agar and Brilliant-green phenol-red Lactose agar (choice
B) are selective media for Salmonella and E. coli, respectively, not differential.
Therefore, the correct choice is C as it includes examples of differential media commonly used for microbial identification.
Question 2 of 5
What is the role of bacterial ribosomes?
Correct Answer: A
Rationale: The correct answer is A: Protein synthesis. Bacterial ribosomes are responsible for translating mRNA into proteins through a process called translation. This is a crucial step in gene expression, where amino acids are assembled into polypeptide chains.
Choice B (DNA replication) is incorrect because ribosomes are not involved in DNA replication.
Choice C (Flagella formation) is incorrect as ribosomes do not play a direct role in flagella formation.
Choice D (
Toxin production) is incorrect as ribosomes are not directly involved in producing toxins.
Question 3 of 5
A duodenal content smear of a patient with indigestion contains protozoa 10-18 mcm large. They have piriform bodies, 4 pairs of filaments, two symmetrically located nuclei in the broadened part of body. What kind of the lowest organisms is it?
Correct Answer: A
Rationale: The correct answer is A: Lamblia. The description matches the characteristics of Giardia lamblia - a protozoan parasite that causes giardiasis. The piriform bodies, 4 pairs of filaments, and two symmetrically located nuclei are specific to Giardia lamblia. It is important to differentiate it from the other choices. Dysentery ameba (choice
B) typically has a single nucleus and lacks the specific characteristics described. Trichomonas (choice
C) is a flagellated protozoan with different morphology and does not match the given description. Intestinal ameba (choice
D) such as Entamoeba histolytica usually has a single nucleus and different body shape compared to the described organism.
Question 4 of 5
Which bacterium is known for producing a green pigment called pyocyanin?
Correct Answer: B
Rationale: The correct answer is B: Pseudomonas aeruginosa. P. aeruginosa is known for producing pyocyanin, a green pigment. This bacterium is commonly associated with infections in immunocompromised individuals. Staphylococcus aureus (choice
A) produces golden-yellow pigments, not green. Escherichia coli (choice
C) and Clostridium difficile (choice
D) do not produce pyocyanin.
Therefore, the correct choice is B based on the characteristic pigment produced by Pseudomonas aeruginosa.
Question 5 of 5
Which of the following diseases is generally caused by contaminated food?
Correct Answer: B
Rationale: The correct answer is B: Shigellosis. Shigellosis is caused by the bacteria Shigella, commonly transmitted through contaminated food and water. The bacteria can spread easily in unsanitary conditions. Mumps (
A) is a viral infection spread through respiratory droplets. Legionellosis (
C) is caused by the Legionella bacteria found in water sources like cooling towers. Tuberculosis (
D) is a bacterial infection transmitted through the air.
Therefore, the correct answer is B as it directly relates to contaminated food transmission.