Q. No.Consider the following statements:
| I: | Innate immunity is a non-specific type of defense that is present at the time of birth. |
| II: | Acquired immunity is pathogen-specific and is characterized by memory. |
| III: | Memory-based acquired immunity developed in higher vertebrates based on the ability to distinguish self from non-self. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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Consider the given two statements:
| I: | The uniqueness of NK [Natural Killer] cells allows them to produce a much faster immune reaction. |
| II: | They have the ability to recognize and kill stressed cells in the absence of antibodies and MHC. |
1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct and II is incorrect.
4. Both I and II are incorrect.
The CD8 T lymphocytes destroy their target cells by releasing a substance that affects:
| 1. | cell membranes | 2. | lysosomes |
| 3. | ribosomes | 4. | DNA molecules |
Opsonization :
| 1. | is the killing of target cells by cytotoxic T cells. |
| 2. | is the secretory component of IgA. |
| 3. | helps increase phagocytosis. |
| 4. | is the interaction that allows IgG to cross the placenta. |
An antibody molecule has an antigen-binding site located in the:
| 1. | hinge region |
| 2. | disulfide bonds |
| 3. | constant region of the L chains |
| 4. | variable regions of the H and L chains |
A person gets infected by a pathogen and is now recovering from the disease. The type of immunity developed would be:
1. naturally acquired active immunity
2. artificially acquired active immunity
3. artificially acquired passive immunity
4. naturally acquired passive immunity
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Interferons are secreted by:
| 1. | Single stranded viruses | 2. | Double stranded viruses |
| 3. | Bacteria infected cells | 4. | Virus infected cells |
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A part of the immune system that enhances the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism, promote inflammation, and attack the pathogen's cell membrane is called as:
| 1. | complement | 2. | interferon |
| 3. | lysozyme | 4. | mucus |
Consider the given two statements:
| I: | Viral infections of human cells are inhibited only by human interferon. |
| II: | In contrast to antibodies, interferons are not virus-specific but host-specific. |
1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct and II is incorrect.
4. Both I and II are incorrect.
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