MDS PREP
Which of the following is NOT a characteristic of anthracoid bacilli?
1) Generally motile
2) Non-capsulated
3) Grow in long chains
4) Pathogenic to laboratory animals
Anthracoid bacilli are generally non-motile and non-capsulated, and they do not grow in long chains.
What is the diameter of prions?
1) 2-4 nm
2) 4-6 nm
3) 10-12 nm
4) 20-25 nm
General Microbiology Answer: 2Prions are extremely small infectious agents, typically measuring between 4 to 6 nanometers in diameter. Their small size contributes to their ability to evade the immune system and resist conventional sterilization methods.
Dry heat sterilization of paper points without incineration is accomplished at
1. 160°C for 2hours
2. 120°C for l hour
3. 100°C for 2 hours
4. 200°C for 1 hour
Microbiology
Answer: 1
Dry heat sterilization of paper points without incineration is accomplished at 160°C for 2hours
What is the typical incubation period for typhoid fever?
1) 1-3 days
2) 4-7 days
3) 10-14 days
4) 21-28 days
General Microbiology Answer: 3The typical incubation period for typhoid fever is 10-14 days: After the ingestion of Salmonella typhi, it typically takes 10-14 days for symptoms to appear. This period can sometimes be shorter or longer, but this is the most common range.
Most viruses are
1. never destroyed by the application of moist heat
2 easily destroyed by the application of moist heat
3 difficult to destroy by the application of moist heat
4 never destroyed because they are not living
Microbiology
Answer: 2
A bacterial disease with oral manifestations is
1. Herpes Measles
2. Measles
3. Diphtheria
4. Leishmaniasis
Microbiology
Answer: 4
Diphtheria serious bacterial infection that usually affects the mucous
membranes of the nose and throat.
Diphtheria signs and symptoms usually begin 2 to 5 days after a person becomes
infected. Signs and symptoms may include:
A thick, gray membrane covering the throat and tonsils
A sore throat and hoarseness
Swollen glands (enlarged lymph nodes) in the neck
Difficulty breathing or rapid breathing
Nasal discharge
Fever and chills
Tiredness
Skin (cutaneous) diphtheria
A second type of diphtheria can affect the skin, causing pain, redness and
swelling similar to other bacterial skin infections. Ulcers covered by a gray
membrane also may be a sign of skin diphtheria.
Two important factors for initiation of caries by oral streptococci are
1 production of glucosyl transferase and synthesis of insoluble dextran
2. production of acid and production or protease
3. production of collagenase and pro- duct ion of hyaluronidase
4. fermentation of mannitol and sorbitol and production of protease.
Microbiology
Answer: 1
Two important factors for initiation of caries by oral streptococci are production of glucosyl transferase and synthesis of insoluble dextran
Which of the following statements is true about the colony morphology and cultural characteristics of Anthrax bacilli?
1) Anthrax bacilli are motile and produce a turbidity in broth.
2) The Medusa head appearance is seen in non-virulent strains of anthrax bacilli.
3) Virulent capsulated strains form smooth colonies.
4) The inverted fir tree appearance is characteristic of Anthracoid bacilli.
General Microbiology Answer: 2
The Medusa head appearance is characteristic of virulent strains of anthrax bacilli.