A. Blue color
B. Red color
C. Green
D. Colorless
✅ The correct answer is option Red color.
Microbiology
The distinguishing characteristic of a positive delayed type hypersensitivity skin test is______________?
A. Erythema
B. Necrosis
C. Induration
D. Vasculitis
✅ The correct answer is option Erythema.
Which of the following is true about pasteurization ?
A. It kills bacteria and spores
B. It kills all bacteria except thermoduric bacteria
C. It kills 95% of microorganisms
D. Tubercle bacilli are destroyed
✅ The correct answer is option It kills all bacteria except thermoduric bacteria.
The causative organism of syphilis is___________?
A. Borrelia burgolorferi
B. Chalamydia trachomatis
C. Leptospira interrogans
D. Treponema pallidum
✅ The correct answer is option Treponema pallidum.
The best sterilization method for a hand-piece is________________?
A. Ethylene oxide gas
B. dry heat
C. chemical vapour
D. All of the above
✅ The correct answer is option Ethylene oxide gas.
Bacterial spores are destroyed by_______________?
A. Boiling at 100°C
B. Disinfection by hypochlorite solution
C. Autoclave
D. Pasteurisation
✅ The correct answer is option Autoclave.
Nagglers reaction detects________________?
A. Coagulase
B. Hyaluronidase
C. Lecithinase
D. None of the above
✅ The correct answer is option Lecithinase.
Pseudohphae are seen in____________?
A. Alternaria
B. Aspergillus
C. Osporium
D. Candida albicans
✅ The correct answer is option Candida albicans.
The following are applicable to bacterial genoms except________________?
A. It is composed of DNA
B. It doe not contain histones
C. It is circular
D. Its DNA has both introns and extrons
✅ The correct answer is option Its DNA has both introns and extrons.
Which of the following have the capability to produce extra cellular polysaccharides______________?
A. Strep. Mutans
B. Strep. pyogenes
C. Peptostreptococcus
D. Enterococcus
✅ The correct answer is option Strep. Mutans.