NEET Questions

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The disease caused by Leishmania and transmitted by Phlebotomus is 

Kala-azar is caused by protozoan Leishmania donovani. It attacks the liver, lymph glands and leucocytes of man, dog and cat and is transmitted by sandfly, phlebotomus sp.


Which type of immunoglobulin is/are abundantly found in foetus?

(b) lgG immunoglobulin only posses the capability to cross the placenta and is found in foetus.

Typhoid fever is caused by a species of 

Typhoid fever is caused by species of Salmonella typhi.

HIV is a member of a group of viruses called

HIV is a member of viruses called retroviruses. It contain ssRNA when it infects the host cell ssRNA is transcribed into cDNA and integrate into DNA.

Humoral immunity system is mediated by

(a) Humoral immunity system is mediated by B-cells. T-cells and natural killer cells are involved in cell medicated immunity.

The type of immunoglobulin present in the foetus are

(c) IgG can only cross the placenta.

Leukaemia is caused by

(b) In human, most of the strontium becomes concentrated in bones, which damage bone cells and marrow blood cells.

An autoimmune disease is

(c) It is a chronic progressive weakness of voluntary muscles especially that of eyes and

Monoclonal antibodies are

(c) Monoclonal antibodies are identical molecules specific for one type of antigen. These are obtained by injecting the target antigen into a rat or mouse. Sometimes later, the spleen cells producing antibodies are isolated and fused with myeloma cells to produce monoclonal antibodies.

During an allergic reaction, the binding of antigens to IgE antibodies initiates a response, in which chemicals cause the dilation of blood vessels and a host of other physiological changes, such chemicals are 

Histamine is released during allergic reactions. Histamine can occur in various tissues bit it is concentrated in connective tissue, it is formed from the amino acid histidine. It causes dilation and increases permeability of small blood vessels, which results in such symptoms as localise swelling, itching, sneezing and runny eyes and nose.