BCR and TCR (alpha/beta) development share which of the following properties? a) Receptor assembled prior to antigen encounter b) Surrogate chain for checkpoints c) RAG expression d) Gene rearrangement e) All of these features are shared What type of cells almost exclusively predominate in healthy intestinal epithelium and lamina propria? a) Naive T cells b) Plasma cells c) Effector leukocytes d) Neutrophils Which molecule is required for the survival signal to naive T cells and is generally upregulated on APCs? a) B7 b) MHC Class II c) MHC Class I d) CD28 Immunosuppressive drugs that degrade IL-2 are administered during organ transplantation. Which cells are affected the most by these drugs? a) Naive T cells b) Activated T cells c) Activated B cells d) Naive B cells

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A:

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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.