The major histocompatibility complex is a :
1. series of complement-enhanced reactions to antigens
2. group of antigens, coded by a family of genes, on the surface of body cells
3. form of autoimmunity
4. the major cause of cancer
MHC, in humans, are also called as Human Leukocyte Antigen. They are vital in organ transplantations. The genes in humans are located on chromosome 6 an exhibit codominance.
Which human worm infestation are we talking about?
I. In socio-economic impact on the human race, it is second only to Malaria.
II. The worm larva enters the human body by penetrating the skin
III. The worm requires snails as an intermediate host.
IV. In developing countries, it is a common cause of anaemia in children.
Malignant tertain malaria is caused by Plasmodium :
Answer : 4
Read page 147 , Xll NCERT
The pathogens responsible for causing elephantiasis are transmitted to a healthy person through:
2. Female mosquito vector
3. Contaminated food and water
4. Sexual contact
Read page 149, Xll NCERT
Interferons are secreted by:
3. Virus infected cells
(3) Read page 151, XII NCERT
The type of immunity responsible for graft rejection by a recipient body is
1. Innate immunity
2. Humoral immunity
3. Cell mediated immunity
4. Either 2 or 3
Which of the following is used in the production of the recombinant Hepatitits B vaccine?
(c) E coli
Answer : 1
The class of antibodies involved in the allergic reaction is:
1. Ig A
2. Ig D
3. Ig E
4. Ig G
(3) Read page 153, XII NCERT
The immune-deficiency becomes marked once the HIV starts destroying
2. T helper cells
3. B lymphocytes
4. Natural killer cells
Read page 156, Xll NCERT
The cells of the malignant tumors exhibit
2. Contact inhibition
3. High differentiation
4. Slow proliferation
Read page 157, Xll NCERT