12. Which of the following statements is not true about active immunity? Select one: a. It forms a specific defense against a particular antigen b. It will last for some time c. The particular antibody formed will react against many different antigens d. It is the result of T cell and B cell activity e. An antigen-antibody reaction must occur   15. What is released by macrophages and dendritic cells to stimulate the immune response? Select one: a. Histamines b. Antigens c. Lymphatic fluids d. Antibodies e. Cytokines

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A: All this is mine handwritten and original work hope this will help

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A: Adaptive immune responses are produced by lymphocytes.

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Q: 3. How does a person get antibodies upon vaccination?

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Q: 4. Define adaptive immunity and describe how it differs from innate immunity.

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A:

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Q: 7. Macrophages recognize target cells using which of the following? A. MHC class I molecules B.…

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Defense Mechanism

Circumstances influence and compel people to behave in a certain way. One such behavior is a defense mechanism. It is employed by people to escape from unpleasant circumstances, thoughts and actions. Defense mechanisms are, thus, psychological strategies that help to avert and avoid unwanted feelings such as guilt or shame and situations such as threat and danger.