37. The anitbody molecule that is found mainly in secretions is a) IgM b) Ig d)

Question

37. The anitbody molecule that is found mainly in secretions is a) IgM b) Ig d) IgE e) IgD A patient is suspected of having tuberculosis. What type of stain would be the most diagnostic? a) Spore b) c) Acid fast d) Capsule e) Methylene Blue 38. Gram 39. What color should a gram negative organism appear after a gram stain? a) Red b) Prple c) Colorless d) Blue Orange In parasitism, the parasite a) Is always intracellular in host tissue b) Derives benefit from the host, but the host is unaffected c) Derives all benefit from the host and the host is harmed d) Is an arthropod e) Always helminth 40. Which disease is usually spread from infected animal to humans via a bite? a) Polio b) Small pox c) d) Rabies e) Amoebic dysentery 41. Measles

Explanation / Answer

37. Correct answer:- (c) Ig A
Explanation:-
(a) IgM - the first antibody secreted during early stages of infection.
- first antibody produced by fetus.
(b) IgG - it is the only immunoglobulin to cross the placenta.
(c) IgA:- secretary IgA found in secretions like tears, milk, saliva, mucus, urine etc.
- non secretory IgA are found in the blood.
(d) IgE:- found in body fluids, tissue and rarely in blood.
- does not cross placenta.
(e) IgD- mainlt found on b cells, in the serum.
-rarely found in secretions.

38. Correct answer:- (c) Acid fast
Explanation:- Tuberculosis is caused by mycobacterium tuberculosis.
- these bacteria contain large amounts of lipid substances within their cell walls called mycolic acids.
- These acids resist staining by ordinary methods such as a Gram stain.
- these are stained by acid fast staining.

39. Correct answer:- (a) Red
Explanation:- method of Gram staining is given below-
-Heat fixed smear is stain with crystal violet.
Crystal violet stain both Gram- and Gram+
- Add Gram's iodine. It will adhere only gram+ because of peptidoglycan in their cell wall.
- wash with acetone for about 30 second.
- Gram- purple dye washed away.
- Gram+:- purple dye remain adherent. - lastly add safranin which will stain cells pink.

Interpretation:-
(a) Gram positive will appear purple- colour of crystal violet.
(b) Gram negative will appear pink- color of safranin.

40. Correct answer:- (c) derives all benefit from the host and host is harmed.
41. Correct answer:- (d) Rabies
Explanation:- Rabies is a viral disease caused by rhabdo virus.
- it is transmitted by an infected animal bite.

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