With addiction to a substance, the tolerance level of receptors
With repeated exposure to addictive substances the tolerance level of body receptors increases. Consequently the receptors respond to higher doses of the substance leading to greater intake and addiction.
Which of the following is due to allergic reaction?
Hay fever is caused due to pollen grains and is an allergic reaction . Rheumatoid arthritis is an example of an autoimmune disease, cancer is a metabolic disorder while hepatitis is a microbial disease.
Which one of the following acts as a physiological barrier to the entry of micro-organisms in human body?
Skin has a metabolic function to prevent non-resident bacteria from developing.
Pick up the correct pair
Plague is transmitted by rat fleas (Xenopsylla)
Shivering in malaria is caused due to
The symptoms of malaria are shown because of release of a toxin haemozoin. This is released when the RBC is ruptured.
Radiations can destroy cancer cells because
In radiotherapy, genes of the cells are damaged by radiations so cells stop dividing.
The organism which causes elephantiasis is a
The causal organism for elephantiasis is Wuchereria, which is a helminthes/nematoda. It is also called filarial worm.
Cancerous cells can easily be destroyed by radiations due to
Cancerous cells can easily be destroyed by radiations due to rapid cell division.
The thymus gland is located
The thymus gland is located near the heart beneath the breast bone.
Mark the correct statement in the followings.
CMI causes rejection of graft.
Widal test is used for confirmation of which of these diseases?
Widal test is a confirmatory test for typhoid.
Which one of the following is an effective painkiller?
Morphine is a sedative and a painkiller, useful for patients who have undergone surgeries.
Colostrum is rich in
Colostrum is the yellowish fluid secreted by the mother in the intial days of lactation and it is rich in IgA.
All are secondary lymphoid organs except
Thymus is a primary lymphoid organ where immature lymphocytes differentiate into antigen sensitive lymphocytes.
Which of the following is not the characteristic of a cancerous cell?
Normal cells have the property of contact inhibition due to which cells stop dividing when they come in contact with one another. Cancer cells appears to have lost this property, as a result they show uncontrolled division.
HIV virus has
The HIV virus is a retrovirus having a protein coat and a single stranded RNA.
Which one of the following is not correctly matched?
Malaria is a vector borne disease that spreads by biting of the female Anopheles mosquito.
Cancer is often the result of activation of which genes?
Cellular oncogenes when activated lead to transformation of normal cells into cancerous cells.
Vaccines help in producing
Vaccines help in producing memory cells in the body which can be stored and provide immunity when the body comes in contact with the pathogen again.
Sudden cessation of heroin can cause
The body gets conditioned to the use of drugs and hence in its absence will show withdrawal symptoms like anxiety,nausea and sweating.
To complete its lifecycle, the malarial parasite requires
For completing its lifecycle the malarial parasite requires two hosts-man and female Anopheles mosquito and the primary host- female Anopheles mosquito is also called vector.The mosquito thus acts as both the host and the vector.
Anamnestic response is
Anamnestic response is a name given to secondary response which occurs due to secondary exposure to a pathogen.
Antibodies are the macromolecule of
Antibodies are the macromolecules of protein.
Common cold is not cured by antibiotics because it is
Common cold is due to rhinovirus. Antibiotics do not kill viruses as they are directed against bacteria, fungi etc.
Which of the following pairs is not correctly matched?
Tetanus is caused by Clostridium tetani, while plague is caused by Pasteurella pestis.
Hepatitis B vaccine are expressed by rDNA technology in
Hepatitis vaccine contain hepatitis B surface antigens and is cloned (rDNA technology) and expressed in yeast cells which is a fungus.
The cells which produce antibodies are
B lymphocytes recognise the antigen with the help of the antibody on its surface and present the processed antigen on the B cell. Then T-lymphocytes recognise the processed anitgen on B cell and activate B-Lymphocytes to produce plasma cells that generate antibodies. T-lymphocytes only activate B cells. Monocytes and neutrophils are not involved in the production of antibodies.
What enters the mosquito when it bites an infected person?
The female mosquito takes up gametocytes when it bites an infected person.
What is true about T-lymphocytes in mammals?
There are three main types-cytotoxic T-cells, helper T-cells and suppressor T-cells
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