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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The principle of immunization or vaccination is based on which property of the immune system?
1. Specificity
2. Memory
3. Ability to recognize self from non-self
4. Cooperation between innate and adaptive immunity
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What type of immunity is used in the treatment of a patient of snakebite?
1. Naturally acquired active immunity
2. Artificially acquired active immunity
3. Artificially acquired passive immunity
4. Naturally acquired passive immunity
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Recombinant vaccine used to prevent Hepatitis B contains:
1. killed hepatitis B virus
2. live attenuated hepatitis B virus
3. antigenic polypeptide of hepatitis B virus
4. messenger RNA of yeast
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Where do the T-lymphocytes develop the ability to recognize self from non-self antigens?
1. | plasma cells | 2. | spleen |
3. | thymus | 4. | liver |
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1. | Bone marrow & Spleen | 2. | Bone marrow & Thyroid |
3. | Lymph nosed & Spleen | 4. | Bone marrow & thymus |
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What constitutes about 50% of the lymphoid tissue in the human body?
1. | Malt | 2. | Spleen |
3. | Lymph nodes | 4. | Liver |
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