Q. No.Identify the correct statement regarding typhoid fever in human beings:
1.
It is caused by a pathogenic protozoan Salmonella typhi
2.
The pathogen remains confined to the small intestine
3.
Widal test can confirm the infection very early in the disease
4.
Intestinal perforation and death may occur in severe cases
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The mechanical carrier of the causative agent of amoebic dysentery is:
| 1. | A protozoan | 2. | House fly |
| 3. | Mosquito | 4. | Rodent |
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Aedes aegypti is not a vector for:
| 1. | Dengue | 2. | Chikungunya |
| 3. | Japanese encephalitis | 4. | Yellow fever |
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Which of the following is also sometimes called as mosquito fish?
| 1. | Bombay duck | 2. | Gambusia |
| 3. | Pacific salmon | 4. | Pomfret |
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What is incorrect regarding innate immunity?
| 1. | It is present at the time of birth |
| 2. | Physiological barriers prevent microbial growth |
| 3. | Natural killers, a cellular barrier, are a type of monocyte |
| 4. | It is a non-specific type of defense |
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B cells:
| 1. | Do not produce antibodies but help T cells produce them |
| 2. | Are pathogen specific but do not retain the memory of previous encounters |
| 3. | Lack ability to distinguish between self and non-self |
| 4. | Are involved in humoral immune response |
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In an antibody molecule, an antigen binding site is located:
1. In the constant portion
2. At the C – terminus of a heavy chain
3. Between a light and a heavy chain
4. Between two heavy chains
Active immunity develops when:
| 1. | A host is exposed to antigens |
| 2. | Antigen presenting cells first encounter the antigen |
| 3. | T helper cells activate B cells to produce antibodies |
| 4. | When a child gets vaccinated for the first time |
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A foetus receiving some antibodies from mother through placenta is an example of:
| 1. | Naturally acquired active immunity |
| 2. | Artificially acquired active immunity |
| 3. | Artificially acquired passive immunity |
| 4. | Naturally acquired passive immunity |
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