Practice 14 MCQs on Microbiology and Parasitology MCQs with OmpathStudy. Built for Kenyan medical and health students to revise key concepts and prepare for...
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Q1. Gram-positive cells:
- Have thick, homogeneous cell walls.
- Have large amounts of teichoic acids.
- Have large molecular chitins.
- Do not have an outer membrane.
- All of the above are true.
- All of the above are true.**
Answer: All of the above are true.
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Q2. The outer membrane of Gram-negative cells is more permeable than the plasma membrane because:
- LPS is larger than most membrane phospholipids.
- Lipoproteins stretch the outer membrane.
- Porin proteins establish holes in the outer membrane.
- The core polysaccharide spans the lipid bilayer.
- None of the above.
- Porin proteins establish holes in the outer membrane.**
Answer: Porin proteins establish holes in the outer membrane.
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Q3. The most important role of the prokaryotic cell wall is to:
- Maintain the shape of the cell.
- Protect the cell from osmotic pressures.
- Prevent ions from diffusing away from the cell.
- Block the effects of antibiotics like penicillin.
- All of the above.
- Protect the cell from osmotic pressures.**
Answer: Protect the cell from osmotic pressures.
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Q4. Which of the following is NOT true about capsules and slime layers?
- They consist of secreted material lying outside of the bacterial cell wall.
- They can prevent desiccation of bacterial cells.
- They are required for bacteria to grow normally in culture.
- They help bacteria resist phagocytosis by macrophages.
- None of the above.
- They are required for bacteria to grow normally in culture.**
Answer: They are required for bacteria to grow normally in culture.
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Q5. A bacillus bacterium with a single flagellum at each end is described as:
- Monotrichous
- Amphitrichous
- Lophotrichous
- Peritrichous
- All of the above
- Amphitrichous**
Answer: Amphitrichous
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Q6. Bacterial capsules are useful for:
- Attachment to surfaces.
- Protection against macrophages.
- Production of toxins.
- Motility.
- Reproduction.
- Protection against macrophages.**
Answer: Protection against macrophages.
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Q7. Which of the following is a true pathogen?
- *Candida*
- *Sporothrix*
- *Mucor*
- *Aspergillus*
- None
- *Sporothrix***
Answer: *Sporothrix*
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Q8. Bacterial capsules are best demonstrated by:
- Methylene blue stain.
- Gram stain.
- Negative staining.
- Impregnation technique.
- None of the above.
- Negative staining.**
Answer: Negative staining.
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Q9. In a light microscope, what function does the condenser serve?
- Focuses the light rays on the sample.
- Magnifies the light rays after their passage through the sample.
- Focuses the light rays into the observer’s eyes.
- Increases the light intensity.
- Reduces glare.
- Focuses the light rays on the sample.**
Answer: Focuses the light rays on the sample.
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Q10. One of the diseases below is not caused by bacteria:
- Leprosy
- Plague
- Rabies
- Tetanus
- Meningitis
- Rabies**
Answer: Rabies
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Q11. The presence of D-amino acids in the crosslinks of the peptidoglycan layer is most likely because:
- Most peptidases can only cleave L-amino acids.
- D-amino acids fit the structural constraints of the cell wall better than L-amino acids.
- Most L-amino acids have already been used for protein synthesis.
- D-amino acids are easier to crosslink in the absence of ribosomes.
- They promote synthesis of much-needed essential amino acids.
- Most peptidases can only cleave L-amino acids.**
Answer: Most peptidases can only cleave L-amino acids.
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Q12. Gram-positive cells:
- Have thick, homogeneous cell walls.
- Have large amounts of teichoic acids.
- Have large molecular chitins.
- Do not have an outer membrane.
- All of the above.
- All of the above.**
Answer: All of the above.
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Q13. Which of the following is not a characteristic of fungi?
- Can be unicellular or multicellular.
- Have cell walls made of chitin.
- Are photosynthetic.
- Can produce antibiotics.
- Can be infected by viruses.
- Are photosynthetic.**
Answer: Are photosynthetic.
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Q14. The spores produced by fungi at the tip of hyphae outside the sporangia are called:
- Conidia
- Endospores
- Zoospores
- Oidia
- Sporangiospores
- Conidia**
Answer: Conidia