Understanding Immune Response: Self vs. Non-Self Recognition

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| Attempts: 11 | Questions: 12 | Updated: Aug 4, 2025
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1. Natural Killer cells are characterized by which of the following?

Explanation

Natural Killer cells are unique immune cells that are derived from the lymphoid cell lineage but exhibit traits of both innate and adaptive immunity. They do not express TCR but express other components of the TCR complex, illustrating their distinct role in the immune system.

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About This Quiz
Understanding Immune Response: Self Vs. Non-self Recognition - Quiz

Explore the complex process of self\/non-self discrimination crucial for immune response. This quiz assesses understanding of immunological principles, focusing on how the body distinguishes between its own cells and foreign entities. Essential for students and professionals in medical and biological sciences.

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2. What is the role of Fc receptors on NK cells in driving ADCC?

Explanation

Fc receptors on NK cells specifically recognize opsonizing antibodies bound to pathogens, leading to target cell destruction through ADCC.

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3. Fc receptor on NK cell can bind opsonizing antibody or circulating antibody (immunoglobulin).

Explanation

The Fc receptor on NK cells can indeed bind opsonizing antibodies as well as circulating antibodies, allowing the NK cells to be pre-primed for recognition and respond to specific pathogens.

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4. What do Fc receptors bind to on immunoglobulins?

Explanation

Fc receptors specifically bind to the Fc domain of immunoglobulins, not the variable region (Fab) or the constant region (CH) on immunoglobulins.

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5. How does the neonatal Fc receptor (FcRn) facilitate the transport of maternal immunoglobulins across the placenta to the fetus?

Explanation

The correct answer explains how the FcRn mechanism operates for the transport of maternal immunoglobulins, highlighting the importance of pH in this process.

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6. What mechanism salvages immunoglobulin from the circulation and delivers secretory antibodies across the lung epithelia?

Explanation

The neonatal Fc receptor (FcRn) is responsible for salvaging immunoglobulin from the circulation and delivering secretory antibodies across the lung epithelia.

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7. What do NK cells kill that CD8+ T cells cannot?

Explanation

NK cells are known for their ability to kill virus-infected cells, tumor cells, as well as aberrant cells, without prior sensitization, which is a function that CD8+ T cells cannot accomplish.

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8. NK cells recognize and kill target cells that are considered 'altered self' because they no longer present MHC-I on their surface.

Explanation

NK cells recognize and kill target cells that are considered 'altered self' due to the absence of MHC-I, which normally provides an inhibitory signal to the NK cells. The absence of MHC-I is a key factor in distinguishing altered self from healthy cells.

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9. What are the two steps involved in thymic selection?

Explanation

Thymic selection involves the two-step process of positive selection for thymocytes that can interact with self-MHC on cortical thymic epithelial cells and negative selection for thymocytes that bind self-peptides presented by self-MHC on medullary epithelial cells, macrophages, or dendritic cells.

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10. What is the goldilocks model?

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11. What are three contributing factors that generate peripheral tolerance of T cells?

Explanation

Peripheral tolerance of T cells is crucial to prevent autoimmune reactions. The correct contributing factors involve sequestration of self-peptides, induction of T-cell anergy through lack of inflammatory response, and suppression of anti-self responses by Treg cells. The incorrect answers provided do not align with the mechanisms described in central and peripheral tolerance processes.

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12. Where does central tolerance of B cells expressing BCRs that strongly recognize self occur?

Explanation

Central tolerance of B cells expressing BCRs that strongly recognize self occurs in the bone marrow due to various mechanisms such as T-cell tolerance generation and B-cell anergy. This process helps in preventing autoimmunity by eliminating or rendering self-reactive B cells unresponsive.

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Natural Killer cells are characterized by which of the following?
What is the role of Fc receptors on NK cells in driving ADCC?
Fc receptor on NK cell can bind opsonizing antibody or circulating...
What do Fc receptors bind to on immunoglobulins?
How does the neonatal Fc receptor (FcRn) facilitate the transport of...
What mechanism salvages immunoglobulin from the circulation and...
What do NK cells kill that CD8+ T cells cannot?
NK cells recognize and kill target cells that are considered 'altered...
What are the two steps involved in thymic selection?
What is the goldilocks model?
What are three contributing factors that generate peripheral tolerance...
Where does central tolerance of B cells expressing BCRs that strongly...
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