microbiology an introduction tortora test bank

Correct Answer: C

Rationale: Disinfection is the process of destroying the vegetative forms of microorganisms, but their spores may survive. This is why choice C is correct. The other choices are incorrect because: A: Disinfection does not necessarily target spore forms exclusively. B: While disinfection targets vegetative forms, it does not always eliminate spore forms. D: Disinfection is not primarily used for determining the effect of physical agents on microorganisms.

Correct Answer: B

Rationale: The correct answer is B: adolescents. Infectious mononucleosis is commonly caused by the Epstein-Barr virus, which is transmitted through saliva. Adolescents are more likely to engage in activities like kissing and sharing drinks, increasing the chances of virus transmission. Infants have maternal antibodies for protection, young adults may have developed immunity, and the elderly have had more exposure to the virus and may have built immunity over time.

Correct Answer: D

Rationale: The correct answer is D (All of the above) because all three bacteria (Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus) are known to cause urinary tract infections. E. coli is the most common causative agent of UTIs due to its ability to colonize the urethra. P. aeruginosa can cause UTIs in hospitalized patients with catheters. S. aureus is less common but can lead to UTIs, especially in individuals with underlying health conditions. Therefore, all three bacteria are potential pathogens for UTIs. Choices A, B, and C are incorrect because each of these bacteria can individually cause UTIs, making the correct answer D.

Correct Answer: A

Rationale: The correct answer is A: Blue pus bacillus. Pseudomonas genus includes bacteria that commonly cause diseases in plants. Blue pus bacillus is a common name for Pseudomonas aeruginosa, a well-known bacterium that causes diseases in medicinal plants. Explanation: 1. Blue pus bacillus (Pseudomonas aeruginosa) is a member of the Pseudomonas genus known for causing diseases in plants. 2. Colon bacillus (Escherichia coli) belongs to the Enterobacteriaceae family, not the Pseudomonas genus. 3. Proteus is a genus of the Enterobacteriaceae family, not Pseudomonas. 4. Mycoplasma is a genus of bacteria that lack a cell wall and are not related to the Pseudomonas genus. In summary, the correct answer is A because it is a member of the Pseudomonas genus known for causing diseases in medicinal plants, while

Correct Answer: B

Rationale: The correct answer is B: Helicobacter pylori. This bacterium is known to be the primary cause of peptic ulcers by colonizing the stomach lining and causing inflammation. It produces urease enzyme to neutralize stomach acid and has a flagellum for mobility. Escherichia coli (A) is mainly associated with foodborne illnesses. Streptococcus pyogenes (C) causes strep throat and skin infections. Mycobacterium tuberculosis (D) causes tuberculosis, a respiratory infection. Therefore, Helicobacter pylori is the correct choice for peptic ulcers based on its unique characteristics and pathogenicity.