foundations in microbiology test bank

Correct Answer: C

Rationale: The correct answer is C, as Gram-negative bacteria have a cell wall containing lipopolysaccharides. This outer membrane structure is unique to Gram-negative bacteria and plays a critical role in pathogenicity and immune response. Teichoic acid (choice A) is found in Gram-positive bacteria. The cell wall of Gram-negative bacteria is thinner than that of Gram-positive bacteria (choice B). The cell wall of Gram-negative bacteria is not composed entirely of peptidoglycan (choice D), as it also contains other components like lipopolysaccharides.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Poxviruses are indeed DNA viruses that replicate in the cytoplasm. This is due to their complex structure that allows them to carry out their replication process in the cytoplasm of the host cell. Other choices are incorrect because poxviruses specifically replicate in the cytoplasm and do not require the nucleus for replication, ruling out choice B. Choice C is incorrect because poxviruses consistently replicate in the cytoplasm regardless of the situation. Choice D is incorrect as the correct answer is A.

Correct Answer: A

Rationale: The correct answer is A: Fluconazole. 1. Fluconazole is an antifungal agent effective against Candida species commonly causing candidiasis. 2. Streptomycin (B) is an antibiotic used for bacterial infections, not fungal. 3. Phthalylsulfathiazole (C) is an antibacterial agent, not antifungal. 4. Ampicillin (D) is a ?-lactam antibiotic, which can actually contribute to fungal infections like candidiasis.

Correct Answer: D

Rationale: The correct answer is D (All of the above) because all three bacteria (Clostridium botulinum, Escherichia coli, Salmonella enterica) are known to cause foodborne infections. Clostridium botulinum can lead to botulism, E. coli can cause various gastrointestinal illnesses, and Salmonella enterica is a common cause of food poisoning. Each bacterium has specific mechanisms that result in foodborne illnesses. Choices A, B, and C are incorrect because each bacterium mentioned is associated with causing foodborne infections, making them collectively the correct answer.

Correct Answer: B

Rationale: The correct answer is B: Order. The suffix -virales is used in virology to denote the order level in the taxonomy of viruses. Orders are higher taxonomic ranks compared to species, family, and genus. The suffix -virales is specifically assigned to virus orders, making choice B the correct one. The other choices (A, C, D) are incorrect because the suffix -virales does not apply to species, family, or genus in the taxonomic classification of viruses.