Showing posts with label MICROBIOLOGY. Show all posts
Showing posts with label MICROBIOLOGY. Show all posts

509. A 2-day-old developing plaque consists primarily of



A. Treponema species.
B. Bacteroides species.
C. filamentous organisms.
D. gram-positive cocci and rods.
E. a structureless, non-mineralized pellicle.

230.A person working in a abattior presented with pustules on hand which turned into ulcer,which will best help in diagnosis?

a.Trichome methylene blue
b.Carbol fuschin
c.Acid fast stain
d.Calcoflour white

Ans-a.Trichome methylene blue


Explanation:Ref harrison 16th ed pg 1280

59.Tuberculosis is immunologically mediated disorder of

a. Autotoxic type b. Immune complex disease
c. Delayed hypersensitivity d. Anaphylactic type

Ans: C. Delayed hypersensitivity: A non-immunized person by a tuberculin skin test, which yields a delayed hypersensitivity type response to purified protein derivatives of M. tuberculosis. Those immunized for TB or with past-cleared infection will respond with delayed hypersensitivity parallel to those currently in a state of infection and thus the test must be used with caution, particularly with regard to persons from countries where TB immunization is common.



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23.Negative staining is used to demonstrate

a. Bacterial spore b. Bacterial flagella

c. Bacterial capsule d. Bacterial fimbriae

Ans.(c): Ref: 14/6th Ananthararayana

Capsules may be readily demonstrated by negative staining in wet films with India ink, when they are seen as clear halos around the bacteria, against a black background


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