461. Plasmid__________________?
A. Involved in multidrug resistance transfer
B. Involved in conjugation
C. Imparts capsule formation
D. Imparts pili formation
✅ The correct answer is option E. Both A & B.
Microbiology MCQs
462. Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are______________?
A. Cocci
B. Spirochetes
C. Bacteriophages
D. Filamentous rods
✅ The correct answer is option Spirochetes.
463. The interaction of antigens with antibodies on the surface of a mast cel leads to degranulation and anaphylaxis. The mast cell granules produce anaphylaxis because they contain________________?
A. Lysosomes
B. Proteolytic enzymes
C. Lymphotoxins
D. Vasoactive mediators
✅ The correct answer is option Vasoactive mediators.
464. Which of the following viruses are most likely to cross placenta and cause foetal defect ?
A. Herpes Simplex
B. Mumps
C. Rubella
D. Papilloma
✅ The correct answer is option Rubella.
465. Complement factor through which common pathway begins___________________?
A. C3
B. C5
C. C2
D. Protein B
✅ The correct answer is option C3.
466. Which of the following provides best gurantee for sterlization in the heat sterilizer ?
A. Using chemical indicator strip or pouch
B. Recording a temperature/ pressure readings from sterilizer guage
C. Using a bacterial spore test
D. Determining the ability of a sterilizer to kill the hepatitis B virus
✅ The correct answer is option Using a bacterial spore test.
467. IL-1 is produced by_________________?
A. Helper T cells
B. Helper B cells
C. Monocytes
D. Macrophages
✅ The correct answer is option Macrophages.
468. Staphylococci typically occur in_________________?
A. Pairs
B. Chains
C. Tetrads
D. Irregular clusters
✅ The correct answer is option Irregular clusters.
469. Rabies virus________________?
A. Cytotropic
B. Dermatotropic
C. Chromophilic
D. Neurotropic
✅ The correct answer is option Neurotropic.
470. Thread worm is______________?
A. Enterobius
B. Ancylostoma
C. Ascaris
D. Necator
✅ The correct answer is option Enterobius.