10. Which air filtration system is capable of removing 99.97% of particles?

(A) Surgical mask

(B) Cloth mask

(C) Depth filter

(D) HEPA filter

(E) Membrane filter

11. The most common archaeal cell envelope structure external to the plasma membrane is the: (A) Capsule (B) Outer membrane (C) Peptidoglycan layer (D) Lipopolysaccharide layer (E) S-layer

12. Which phase of the microbial growth curve is associated with genetic diversity and evolution? (A) Lag phase (B) Exponential phase (C) Stationary phase (D) Death phase (E) Long-term stationary phase

13. Loss of the MinCDE system in (E) coli would most likely lead to: (A) Elongated filamentous cells (B) Septa forming near cell poles (C) Inhibition of DNA replication (D) Defective MreB localization (E) Failure of chromosome condensation

14. Why do Gram-positive bacteria retain crystal violet dye during Gram staining? (A) Presence of an outer membrane (B) High lipid content (C) Thick, highly cross-linked peptidoglycan (D) Teichoic acid removal (E) Porin closure

15. Which conclusion best explains why Mycoplasma (黴漿菌) species are intrinsically resistant to β-lactam antibiotics? (A) They lack ribosomes (B) They possess an outer membrane (C) They have altered porins (D) They lack a cell wall (E) They degrade antibiotics enzymatically

16. Which limitation applies to Koch's postulates? (A) Some pathogens cannot be cultured (B) They cannot be used for bacteria (C) They require genetic sequencing (D) They apply only to viruses (E) They exclude animal models

17. Which factor most limits the usefulness of fluorescence microscopy for long-term live-cell imaging? (A) Low numerical aperture (B) Requirement for thin specimens (C) Photobleaching and phototoxicity (D) Inability to label proteins (E) Low magnification

18. Which of the following sentence best describes why viruses are considered necessary intracellular pathogens? (A) They can reproduce independently, but they tend to replicate faster inside cells. (B) They lack ribosomes and mitochondria and must hijack host machinery to make new virions. (C) They reproduce only through cell division and require host nutrients for energy. (D) They are always larger than bacteria, so they must use host cells for transport. (E) They can replicate their genome outside cells but require cells only for entry.

19. Which pairing correctly matches "recognition and attachment" for naked vs. enveloped viruses? (A) Naked: glycoprotein spikes; Enveloped: capsid proteins. (B) Naked: host antibodies; Enveloped: host ribosomes. (C) Naked: capsid proteins; Enveloped: viral glycoproteins (spikes). (D) Naked: MHC class I; Enveloped: MHC class II. (E) Naked: RNA polymerase; Enveloped: DNA polymerase.

20. A student describes a viral particle as "genome enclosed in capsid." Which term is the most precise match? (A) Capsomer. (B) Virion envelope. (C) Micelle. (D) Nucleocapsid. (E) Glycoprotein spike.

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