251. True about HIV are all except______________?
A. DNA virus
B. Attacks CD4 cells
C. Macrophages are the reservoir
D. Decrease CD4 count in late stages
✅ The correct answer is option DNA virus.
Microbiology MCQs
252. A darkfield microscope would be useful in examining blood for_______________?
A. Treponema
B. Actinomyces
C. Streptococcus
D. Mycobacterium
✅ The correct answer is option Treponema.
253. Viron is defined as______________?
A. Extracellular infectious virus particle
B. Smallest virus
C. A smallest particle similar to virus
D. None of the above
✅ The correct answer is option Extracellular infectious virus particle.
254. Vibrio cholera was discovered by_________________?
A. Koch
B. Medintoff
C. John snow
D. Virchow
✅ The correct answer is option Koch.
255. Tuberculin test screens for_____________?
A. Hemoral immunity
B. Cell mediated immunity
C. Complement function
D. Phagocyte dysfunction
✅ The correct answer is option Cell mediated immunity.
256. Bacteria acquire characteristics by all the following except_______________?
A. Through plasmids
B. Incorporating part of host DNA
C. Through bacteriophages
D. Through conjugation
✅ The correct answer is option Incorporating part of host DNA.
257. Which of the following would you consider to be general properties of viruses______________?
A. New virus particle arises directly (by division) from preexisting viruses
B. Fall in to the general size range of 200-3000 angstrom unit
C. Contain equal proportions of protein, lipo polysaccharide and nucleic acids
D. Contain DNA but no RNA
✅ The correct answer is option Fall in to the general size range of 200-3000 angstrom unit.
258. Example of immune complex hyper-sensitivity reaction is______________?
A. Atopic allergy
B. Serum sickness
C. Transfusion reaction
D. Contact dermatitis
✅ The correct answer is option Serum sickness.
259. Salivary peroxidise system is known to be effective agianst________________?
A. Actinomyces viscosus
B. Lactobacillus acidophilus
C. Streptococcus mutans
D. Veilonella parvula
✅ The correct answer is option Lactobacillus acidophilus.
260. Negative staining is used to demonstrate________________?
A. Bacterial spore
B. Bacterial Flagella
C. Bacterial capsule
D. Bacterial fimbriae
✅ The correct answer is option Bacterial fimbriae.